Fuel Economy - Page 44 - Toyota Yaris Forums

BMGYaris · 11-19-2006, 03:23 AM

yea, i have read somewhere somethinga bout a car length for ever 10 mph, but whatever. Anyway, we should all write mythbusters. It would be interesting to see exactly what distances behind a big truck change mpg and how much per distance. My initial thoughts are that if you drive far enough behind the truck to have decent visibility, then there wouldnt be too much advantage as the wind would have...i dont know..repositioned?:) anyway, lets send some emails to mythubusters with this one.

spkrman · 11-19-2006, 06:05 AM

it would also be uncomfortable for the truck driver to have a lil car that he probably can't see behind him. Maybe the biggest gain in MPG you can get is a CB radio? :)

swng · 11-19-2006, 04:59 PM

Just for academic discussion, and don't do it a home. Professionals do agree that following a big truck in front can save fuel. Please read this review (to save time, please go direct to the paragraphs under the sub-heading "Fuel economy run"):

http://autos.msn.com/research/vip/jo...&model=E-Class

Here is a quotation from that web page:

"We used a different strategy when we got on the highway, though. We sought to draft behind large vehicles—in actuality, tucking closely behind a pickup truck towing a camper, and later getting behind a semi. But this meant we couldn't see much ahead of us, and we were required to match the speed of the bigger vehicle directly in front."

Note in particular that there are comments about the disadvantages of so doing in the same paragraph. For daily driving, I suggest safety first.

More discussions in this and other aspects of fuel economy are welcome, friends!

ECHOKnight2000 · 11-19-2006, 08:12 PM

I read that following a truck closely you can coast but its very ideal conditions, meaning the draft of the truck pulls the car of course bigger cars it would be harder but for the sake of the Yaris...obviously this is dangerous. There is a point where the truck's draft creates a turbulance so the car is shaking, sort of like a jet stream (not saying it is just a comparison). Sorry I'm not to knowledgable on the techincal words. Anyway you have to follow really close and for the sake of mpg, no not worth it, you're asking for trouble or a death sentence. Just my .02

tds12 · 11-19-2006, 09:56 PM

You don't need to be real close to see a difference in the scanguage MPG. 6-10 lengths. This is way farther back than typical freeway driving in Seattle.
Also it doesn't have to be a large truck any vehicle that disturbs the air in front of the Yaris. Larger vehicles work better but it is a noticable decrease following any vehicle.

spkrman · 11-19-2006, 11:05 PM

scanguage is definitely on my list of things to get... now a very long and expensive list!

nsmitchell · 11-20-2006, 10:21 AM

Holding steady at 31mpg. I am not really driving for mileage. Lots of lights, lots of stomping on the gas. ;) I am still waiting to take a good long road trip to check out maximum mileage. Hopefully around 40 something.

spkrman · 11-20-2006, 10:58 PM

premium did fine in my yaris, no major gain anywhere though.

nsmitchell · 11-21-2006, 09:40 AM

Quote:

Originally Posted by spkrman

premium did fine in my yaris, no major gain anywhere though.

Premium gas is ONLY for high compression engines. To put it in your Yaris is truly wasting money. In the following article, he even mentions "The Family Toyota".

http://www.straightdope.com/columns/041008.html

fearturtle44 · 11-21-2006, 10:06 AM

I would recommend a fuel injector cleaner every 7500 miles. Just put in an empty tank prior to fill.

Kevin

keesue · 11-21-2006, 05:02 PM

I concur with the statement: "Premium is for high compression engines". The Yaris is not a high compresson engine and does not require premium. It does not suffer detonation which is the sign of an octane level insufficient to support fuel burn over explosion (detonation). It is a complete waste of money. As to fuel system cleaners, if one exclusively uses a high quality fuel, such as Chevron with Techron, it is less of a requirement. Most new vehicle certifications for emissions and fuel efficiency ratings are performed using Chevron (by the way). The difference in cost between grades can be significantly offset by using a fuel system cleaner when using lower grade fuel.

bigsky2 · 11-21-2006, 07:14 PM

Right now my mileage is approximately 7.5~7.9L per 100KM.

I usually fill up with two or three bars remaining and calculate the mileage from the amount I travelled on the trip and the amount of gas that filled up the tank.

I did run the gauge to the last bar last week, and I filled up. It was about 38 litres or so and my trip was about 500 km. Works out to about 7.6L per 100km.

Not too shabby, but not the best either. I don't think I can achieve 6.9L per 100KM (stated City mileage by Toyota) unless I turn my car back into its stock form.

Violin · 11-21-2006, 07:17 PM

Liters?

Kilometers?

What is this - Soviet Russia?

Lafiro · 11-21-2006, 07:24 PM

Quote:

Originally Posted by Violin

Liters?

Kilometers?

What is this - Soviet Russia?

Yeah seriously, WTF is all that. I just want a plain answer/response like 30mpg. Not no 1324L per 2398443something.

Billstein · 11-24-2006, 03:32 PM

My first tank on the silver car was 35 mpg us ,
My second was on a road trip ok I was in a hurry.
I recieved a bit lower 29 M.P.G. us
I was driving around 80mph to 85mph +
I know very sad.

But she wanted to go.

superjens · 12-06-2006, 01:52 AM

I just picked up a 2007 3-door 5-speed a few weeks ago, and I'll be tracking my mileage closely as I've done with all my cars in the past. A year ago I drove a 13-MPG SUV, sold it and went to a 50-MPG Diesel Golf, and now I'm curious to see how far I can push this Yaris. First tank got me just a hair under 30 MPG, but I have no idea if the tank really was full to start off with.

I've been using the same simple speadsheet forever, which calculates from liters into gallons, kms into miles, so I can see both L/100KM and MPG quickly. It also plots everything into a graph for visuals.

I only have 1 fillup so far, but you can see what the end result is here:

http://www.superjens.com/cars/Yaris-Stats/index.htm

If you want the spreadsheet for yourself:

http://www.superjens.com/cars/Yaris-Stats/stats.xls

When I had the 13-MPG SUV (two years worth of city/hwy/offroad averages), I drove across Canada and back in it one summer. With a few tricks and some really careful driving I managed to get 26 MPG average! That was with a bike and other junk on the roof.

I'm looking forward to some long road trips next summer in this little Toyota, my bet is I'll be able to squeeze 50 MPG out of it.

bigsky2 · 11-21-2006, 07:25 PM

Whoa chill out buddies.

bigsky2 · 11-21-2006, 07:34 PM

Komrades, I repeat.

7.6~7.9 LITRES PER 100 KILOMETERS. WINTER MILEAGE.

BRRRR.

11-19-2006, 08:12 PM	#4
ECHOKnight2000 Small Car Lover View User's Garage Drives: A Super Car Join Date: Jun 2006 Location: Minnesota, US of A! Posts: 830	I read that following a truck closely you can coast but its very ideal conditions, meaning the draft of the truck pulls the car of course bigger cars it would be harder but for the sake of the Yaris...obviously this is dangerous. There is a point where the truck's draft creates a turbulance so the car is shaking, sort of like a jet stream (not saying it is just a comparison). Sorry I'm not to knowledgable on the techincal words. Anyway you have to follow really close and for the sake of mpg, no not worth it, you're asking for trouble or a death sentence. Just my .02 __________________ You may look good on the beach but in reality you're a pompus, egotistical jerk. "I was never on the beach with you..."and you never will.

11-19-2006, 09:56 PM	#5
tds12 This is my other ride. Drives: Wht, M, Power 2007 yaris HB Join Date: Apr 2006 Location: Wa state Posts: 43	Drafting You don't need to be real close to see a difference in the scanguage MPG. 6-10 lengths. This is way farther back than typical freeway driving in Seattle. Also it doesn't have to be a large truck any vehicle that disturbs the air in front of the Yaris. Larger vehicles work better but it is a noticable decrease following any vehicle.

11-20-2006, 10:21 AM	#7
nsmitchell View User's Garage Drives: LB-Auto-PWR-ABS-Cruise-Springs Join Date: Aug 2006 Location: Richmond, VA Posts: 1,065	Holding steady at 31mpg. I am not really driving for mileage. Lots of lights, lots of stomping on the gas. ;) I am still waiting to take a good long road trip to check out maximum mileage. Hopefully around 40 something. __________________ Other car is a 2005 Mustang Convertible 4.0L V6 Manual - Legend Lime Get YarAss in gear! RIP - Casey Tatum

11-21-2006, 05:02 PM	#11
keesue Chillin' out by the Bay Drives: 2007 Yaris Liftback Join Date: Nov 2006 Location: The back streets of San Fran Posts: 151	I concur with the statement: "Premium is for high compression engines". The Yaris is not a high compresson engine and does not require premium. It does not suffer detonation which is the sign of an octane level insufficient to support fuel burn over explosion (detonation). It is a complete waste of money. As to fuel system cleaners, if one exclusively uses a high quality fuel, such as Chevron with Techron, it is less of a requirement. Most new vehicle certifications for emissions and fuel efficiency ratings are performed using Chevron (by the way). The difference in cost between grades can be significantly offset by using a fuel system cleaner when using lower grade fuel. __________________ Gettin' all the way down. Meteorite '07 HB STILL completely stock; but.... checkin' out da other ones to see what's what.

11-21-2006, 07:14 PM	#12
bigsky2 Cousin Vitz View User's Garage Drives: Yaris RS 5DR / Vitz RS wannabe Join Date: Mar 2006 Location: Vancouver, Canada Posts: 1,082	Right now my mileage is approximately 7.5~7.9L per 100KM. I usually fill up with two or three bars remaining and calculate the mileage from the amount I travelled on the trip and the amount of gas that filled up the tank. I did run the gauge to the last bar last week, and I filled up. It was about 38 litres or so and my trip was about 500 km. Works out to about 7.6L per 100km. Not too shabby, but not the best either. I don't think I can achieve 6.9L per 100KM (stated City mileage by Toyota) unless I turn my car back into its stock form. __________________ 2007 Yaris RS Hatchback Black Sand Pearl 5DR MT DIY Speaker Spacer/Bracket Template for Yaris Hatchback http://www.yarisworld.com/forums/showthread.php?t=1930

11-19-2006, 03:23 AM	#1
BMGYaris Drives: Yaris 3dr Hatchback Join Date: Oct 2006 Location: South Carolina, USA Posts: 255	yea, i have read somewhere somethinga bout a car length for ever 10 mph, but whatever. Anyway, we should all write mythbusters. It would be interesting to see exactly what distances behind a big truck change mpg and how much per distance. My initial thoughts are that if you drive far enough behind the truck to have decent visibility, then there wouldnt be too much advantage as the wind would have...i dont know..repositioned?:) anyway, lets send some emails to mythubusters with this one.

11-19-2006, 06:05 AM	#2
spkrman Banned View User's Garage Drives: 1 Join Date: Nov 2006 Location: 2 Posts: 1,476	it would also be uncomfortable for the truck driver to have a lil car that he probably can't see behind him. Maybe the biggest gain in MPG you can get is a CB radio? :)

11-19-2006, 04:59 PM	#3
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	Just for academic discussion, and don't do it a home. Professionals do agree that following a big truck in front can save fuel. Please read this review (to save time, please go direct to the paragraphs under the sub-heading "Fuel economy run"): http://autos.msn.com/research/vip/jo...&model=E-Class Here is a quotation from that web page: "We used a different strategy when we got on the highway, though. We sought to draft behind large vehicles—in actuality, tucking closely behind a pickup truck towing a camper, and later getting behind a semi. But this meant we couldn't see much ahead of us, and we were required to match the speed of the bigger vehicle directly in front." Note in particular that there are comments about the disadvantages of so doing in the same paragraph. For daily driving, I suggest safety first. More discussions in this and other aspects of fuel economy are welcome, friends!

11-19-2006, 11:05 PM	#6
spkrman Banned View User's Garage Drives: 1 Join Date: Nov 2006 Location: 2 Posts: 1,476	scanguage is definitely on my list of things to get... now a very long and expensive list!

11-20-2006, 10:58 PM	#8
spkrman Banned View User's Garage Drives: 1 Join Date: Nov 2006 Location: 2 Posts: 1,476	premium did fine in my yaris, no major gain anywhere though.

11-21-2006, 10:06 AM	#10
fearturtle44 Drives: S Flint Mica Join Date: May 2006 Location: Virginia Posts: 209	I would recommend a fuel injector cleaner every 7500 miles. Just put in an empty tank prior to fill. Kevin

11-21-2006, 07:17 PM	#13
Violin View User's Garage Drives: 2007 Yaris LB Auto Join Date: Jul 2006 Location: New Jersey Posts: 1,592	Liters? Kilometers? What is this - Soviet Russia?

11-24-2006, 03:32 PM	#15
Billstein Whew Who.. Drives: 2 Yaris Hatchs and Tacoma Join Date: May 2006 Location: So. Ca. Posts: 78	Mpg My first tank on the silver car was 35 mpg us , My second was on a road trip ok I was in a hurry. I recieved a bit lower 29 M.P.G. us I was driving around 80mph to 85mph + I know very sad. But she wanted to go. __________________ "HERS"2007 Yaris Hatch BlazzingBlue Power everything Sirius Radio FullSyn Oil 50% tint windshild35% front 5% rear Keyless Entry Alum TRD Shift Knob TRD Exh Tip 17" racing harts/Falkins TRD Cold Air Intake "HIS"2007 Yaris Hatch MedSilverMetallicPower PQ Package 17" Wheels Spoiler TRD ExhTipStiletto100 Radio Armrest 50% tint windshild 35% front windows 5% rear Aluminum TRD Shift Knob Keyless Entry VIP Alarm TRD Cold Air Intake

12-06-2006, 01:52 AM	#16
superjens Drives: 2007 Yaris Hatch Join Date: Nov 2006 Location: Vancouver, BC Posts: 9	I just picked up a 2007 3-door 5-speed a few weeks ago, and I'll be tracking my mileage closely as I've done with all my cars in the past. A year ago I drove a 13-MPG SUV, sold it and went to a 50-MPG Diesel Golf, and now I'm curious to see how far I can push this Yaris. First tank got me just a hair under 30 MPG, but I have no idea if the tank really was full to start off with. I've been using the same simple speadsheet forever, which calculates from liters into gallons, kms into miles, so I can see both L/100KM and MPG quickly. It also plots everything into a graph for visuals. I only have 1 fillup so far, but you can see what the end result is here: http://www.superjens.com/cars/Yaris-Stats/index.htm If you want the spreadsheet for yourself: http://www.superjens.com/cars/Yaris-Stats/stats.xls When I had the 13-MPG SUV (two years worth of city/hwy/offroad averages), I drove across Canada and back in it one summer. With a few tricks and some really careful driving I managed to get 26 MPG average! That was with a bike and other junk on the roof. I'm looking forward to some long road trips next summer in this little Toyota, my bet is I'll be able to squeeze 50 MPG out of it.

11-21-2006, 07:25 PM	#17
bigsky2 Cousin Vitz View User's Garage Drives: Yaris RS 5DR / Vitz RS wannabe Join Date: Mar 2006 Location: Vancouver, Canada Posts: 1,082	Whoa chill out buddies. __________________ 2007 Yaris RS Hatchback Black Sand Pearl 5DR MT DIY Speaker Spacer/Bracket Template for Yaris Hatchback http://www.yarisworld.com/forums/showthread.php?t=1930

11-21-2006, 07:34 PM	#18
bigsky2 Cousin Vitz View User's Garage Drives: Yaris RS 5DR / Vitz RS wannabe Join Date: Mar 2006 Location: Vancouver, Canada Posts: 1,082	Komrades, I repeat. 7.6~7.9 LITRES PER 100 KILOMETERS. WINTER MILEAGE. BRRRR. __________________ 2007 Yaris RS Hatchback Black Sand Pearl 5DR MT DIY Speaker Spacer/Bracket Template for Yaris Hatchback http://www.yarisworld.com/forums/showthread.php?t=1930