Fuel Economy

[yarswiss]

I just got 40mpg! W00T! Haha I usually get around 50, but this tank I decided to go berserk and see just how LOW I could take it. Driving at 80-90mph, treating each green light like a drag strip, going flat-out on the gas on uphills, etc. I was going to get 36mpg at one point, but then I started driving on the freeway again, and my numbers went up, darn it!

[mkaresh]

Originally Posted by briman

I'm routinely 26 mpg in the city. I do not drive the car hard. My last tank was 23 mpg, all city. I'm more than a bit disappointed. I'm beginning to wish I had just bought a corolla or camery.

The automatic isn't helping. But the big difference is the number of stops per mile--people mean very different things by "city." The more there are, the better off you would have been in a Prius.

The figures owners have been reporting on TrueDelta's Fuel Economy Survey:

Toyota Yaris fuel economy

[Stargate YARlantIS]

Each bar is 1.3875 gals....if my calculations are correct.

[BailOut]

Originally Posted by briman

I'm routinely 26 mpg in the city. I do not drive the car hard. My last tank was 23 mpg, all city. I'm more than a bit disappointed. I'm beginning to wish I had just bought a corolla or camery.

Hello briman,

Please read through the 3 stickies in this subforum for some additional ideas on how to improve your mileage.

[briman]

Originally Posted by mkaresh

The automatic isn't helping. But the big difference is the number of stops per mile--people mean very different things by "city." The more there are, the better off you would have been in a Prius.

The figures owners have been reporting on TrueDelta's Fuel Economy Survey:

Toyota Yaris fuel economy

I have auto/sedan. My city driving is in a town of 20,000 people, so a lot of stop and go driving. Stop signs every quarter mile or so. No merges or blending traffic like in a larger metro. It's also colder which means it's idled longer than normal. But still, 23 mpg is disappointing. It is under 3000 mile and I'm hoping for improvement upon break in. I do not mash it ever I coast as much as possible but I do keep up to the speed limit. Some people tell me their Corolla is getting better mileage. Or their lying.

Hello briman,

Please read through the 3 stickies in this subforum for some additional ideas on how to improve your mileage.

Thanks, I always welcome advice.

[mkaresh]

Originally Posted by Stargate YARlantIS

Each bar is 1.3875 gals....if my calculations are correct.

I doubt the gauge is this precise or this linear. At least I've never come across one that was.

There's one reasonably accurate way to measure fuel economy. Fill the tank. Drive. Fill the tank again (hopefully to the same point each time--two clicks with a few seconds in between is what I do). Divide miles driven by gallons used.

Some people might think this method is just common sense. But I've come across many people who estimate MPG based on the fuel gauge. Usually a bad idea.

[voodoo22]

Originally Posted by briman

I have auto/sedan. My city driving is in a town of 20,000 people, so a lot of stop and go driving. Stop signs every quarter mile or so. No merges or blending traffic like in a larger metro. It's also colder which means it's idled longer than normal. But still, 23 mpg is disappointing. It is under 3000 mile and I'm hoping for improvement upon break in. I do not mash it ever I coast as much as possible but I do keep up to the speed limit. Some people tell me their Corolla is getting better mileage. Or their lying.



Thanks, I always welcome advice.

Sounds like 2 major things you could focus on is getting off the gas when approaching stops and your car is above idling rpm (around 1300 rpm and up from what I've read.) to benefit from DFCO and I cannot stress enough how you cannot go too lightly on the throttle from a dead stop. Initial acceleration cannot be too slow in those situations. Bailout talks about hang time when you are already moving, and that's another example how a sensative touch on the throttle can result in large savings in gas. That doesn't mean you should accelerate slowly when at hwy speeds (once you get going it's more efficient to accelerate at a much faster rate then when you are starting from a dead stop), but learn how to give the car the least amount of throttle to achieve your necessary speed.

[TinyGiant]

Miles --- gal-- MPG
276.0-- 7.824-- 35
367.0-- 9.977-- 36
215.0-- 6.294-- 34
247.0-- 6.264-- 39
316.0-- 8.231-- 38
249.3-- 7.134-- 34
277.6-- 8.164-- 34
295.9-- 8.558-- 34
345.0-- 10.247-- 33
319.9-- 10.507-- 30
315.0-- 9.892-- 31
261.2-- 8.439-- 30

lol.. can you tell when i put on my rims/tires and took off the stock ones?
i've also started getting more relaxed driving a little faster... i guess i'll have to get back on the ball.



this is with no engine mods, 205/40/17 tires on enkei rims, custom woofer box in the back that probably weights 20-30 lbs

[talnlnky]

Originally Posted by TinyGiant

Miles --- gal-- MPG
276.0-- 7.824-- 35
367.0-- 9.977-- 36
215.0-- 6.294-- 34
247.0-- 6.264-- 39
316.0-- 8.231-- 38
249.3-- 7.134-- 34
277.6-- 8.164-- 34
295.9-- 8.558-- 34
345.0-- 10.247-- 33
319.9-- 10.507-- 30
315.0-- 9.892-- 31
261.2-- 8.439-- 30

lol.. can you tell when i put on my rims/tires and took off the stock ones?
i've also started getting more relaxed driving a little faster... i guess i'll have to get back on the ball.



this is with no engine mods, 205/40/17 tires on enkei rims, custom woofer box in the back that probably weights 20-30 lbs

OUCH!.... I hate myself unless i get 40+mpg. Even when i've got some weight in the car and drive 80 I still manage 35+ mpg.

[landrym28]

I can usually crack the 40mpg mark in the summer, but in the winter, I'm usually in the 29-33mpg range. It's good that gas prices have decreased so far, as it kind of offsets the fact that I can't get as far on a tank.

[BailOut]

Originally Posted by TinyGiant

Miles --- gal-- MPG
276.0-- 7.824-- 35
367.0-- 9.977-- 36
215.0-- 6.294-- 34
247.0-- 6.264-- 39
316.0-- 8.231-- 38
249.3-- 7.134-- 34
277.6-- 8.164-- 34
295.9-- 8.558-- 34
345.0-- 10.247-- 33
319.9-- 10.507-- 30
315.0-- 9.892-- 31
261.2-- 8.439-- 30

lol.. can you tell when i put on my rims/tires and took off the stock ones?
i've also started getting more relaxed driving a little faster... i guess i'll have to get back on the ball.



this is with no engine mods, 205/40/17 tires on enkei rims, custom woofer box in the back that probably weights 20-30 lbs

Whoa... With gas at $3 those wheels are costing you $200 per year, and driving faster is costing you another $200 per year.

[TinyGiant]

yeah I plan on starting to hypermile more again and keep it under 55 on the hwy

35 seems to be about the best i can get with the wheels .. but they make the car look so sporty.. lol i'm not going to get rid of them

with the money i'm saving since i got rid of my jeep 16-18mpg that $200 a year is nothing lol

[voodoo22]

..and if you haven't taken the new tire size into account in your calculations, you can add another 1+% to your figures, because that's about how much further the odometer will read over actual with that new setup if you went from 15's. If you went from the stock 14's then you can double that difference to 2+%. It's not a lot, but it adds up by the end of the year.

[TinyGiant]

my spedometer is about 4mph higher than actual speed at about 50mph

[TinyGiant]

if i remember right

[TinyGiant]

it just dawned on me..

when the mpg started going south was when the weather started getting colder.. and i had to run the Defroster for the front windshield alot.. from what i was reading earlier the defroster runs the AC too... thats probably more likely the cause.. whenever i have the heat on its always on the defrost/footwell setting...

[Jem_hadar]

Originally Posted by mkaresh

I've come across many people who estimate MPG based on the fuel gauge. Usually a bad idea.

LOL! Thats too funny!

[Revsson]

Originally Posted by TinyGiant

it just dawned on me..

when the mpg started going south was when the weather started getting colder.. and i had to run the Defroster for the front windshield alot.. from what i was reading earlier the defroster runs the AC too... thats probably more likely the cause.. whenever i have the heat on its always on the defrost/footwell setting...

In my 2009 owner's manual, page 178 states that:
"If A/C is not pressed, the system will blow ambient temperature air or
heated air."
And then later on page 183, it states:
"When the outside air temperature approaches 32 F (0 C)
The air conditioning system may not operate even when A/C is pressed."

Perhaps that has changed from the 2007 or 2008 model year, as my buddy
who has a 2007 said that he thought the A/C came on automatically when
he moved the selector to the feet and windshield defroster setting.

Is that a definitive answer or not.

I have heard that other makes of cars use the A/C when in defrost, but who knows?