Am I calculating MPG correctly? - Toyota Yaris Forums

YarisBlazer · 08-09-2007, 09:47 PM

Ok, this is the second time I've tried to figure out my MPG; I want to make sure I am doing this right; this is how I calculate it:

Odometer reading now minus odomter reading at last fill-up divided by amount of gas I put in tank at this fill-up

Of course I always fill it all the way to full

I just filled up so today's equation is:

2623 (Odometer reading now at fill-up)
- 2262 (Reading at last fill-up)
____
361 divided by 11.551 gallons = 31.252 MPG

Is this right? I am doing mostly city driving so I would like to get this up to at last 36 MPG if I can; I'm in Florida so must run the A/C while driving.

Thanks for any input; my last reading was 32 MPG.

xed · 08-09-2007, 10:44 PM

Yep you got it.

petesimac · 08-09-2007, 10:52 PM

Only thing is, the tank only has a capacity of 11.5 gallons; how did you cram in more? Are you running the car all the way until it is on fumes? If so, that could be part of the problem. I've heard of Yari that run out of gas (or perhaps come close) needing to be reset afterwards. I fill up as soon as the second to last bar disappears, leaving the one, flashing bar. At this point, my tank can only take just under 10 gallons to fill it up again.

Oh, and instead of having to recalculate your miles, use your trip odometer instead. Everytime you fill up, press and hold the little black button near the trip odometer meeting until it goes back to 0; that'll leave you with one less equation to complete.

swng · 08-09-2007, 11:10 PM

Please refer to Post #1350 of the Fuel Economy Thread here for some useful mpg calculators:http://www.yarisworld.com/forums/sho...p?t=38&page=90
There is another one in Post #1422 of the same thread.

sherryberry · 08-09-2007, 11:11 PM

i'm confused as how you got that many gallons of gas into that gas tank as well. and like petesimac says, use your odometer. that's what it's there for. I use trip A to calculate MPG and trip B to calculate next oil change

seanele · 08-09-2007, 11:16 PM

Quote:

Originally Posted by YarisBlazer

Ok, this is the second time I've tried to figure out my MPG; I want to make sure I am doing this right; this is how I calculate it:

Odometer reading now minus odomter reading at last fill-up divided by amount of gas I put in tank at this fill-up

Of course I always fill it all the way to full

I just filled up so today's equation is:

2623 (Odometer reading now at fill-up)
- 2262 (Reading at last fill-up)
____
361 divided by 11.551 gallons = 31.252 MPG

Is this right? I am doing mostly city driving so I would like to get this up to at last 36 MPG if I can; I'm in Florida so must run the A/C while driving.

Thanks for any input; my last reading was 32 MPG.

great..my brain stuck at the dividing part..

oh whatever!!
i know i did one and a half gallon from El Monte to Victorville.
and..when coming back, a little less than that..., damn i love my Yaris!!

swng · 08-09-2007, 11:20 PM

Re Posts #1,3, and 5 above:
My practical experience is if you ignore the click of the nozzle and try hard to overfill, it is possible to "squeeze" more than the max volume specified in the user manual into the tank. It may not be advisable to do so though. Please see:http://www.epa.gov/donttopoff/

YarisBlazer · 08-09-2007, 11:20 PM

My last bar was flashing; my gas recept said I put in 11.551 gallons; I dont know how it happened either; maybe I have a big tank

?

swng · 08-09-2007, 11:34 PM

Some useful experience shared here:
http://www.yarisworld.com/forums/sho...+tank+capacity
Not every post there is relevant to the present topic though

.

Pars · 08-10-2007, 07:16 AM

Quote:

Originally Posted by YarisBlazer

My last bar was flashing; my gas recept said I put in 11.551 gallons; I dont know how it happened either; maybe I have a big tank

?

Try another gas station, perhaps their pumps are better calibrated.

sherryberry · 08-10-2007, 10:39 AM

wow i didn't know that some gas stations does that to rip people off. I don't think i've had an issue where the amount of gas i put in is more than the amount of the tank.

petesimac · 08-10-2007, 11:25 AM

Quote:

Originally Posted by YarisBlazer

My last bar was flashing; my gas recept said I put in 11.551 gallons; I dont know how it happened either; maybe I have a big tank

?

How long had it been flashing? If it had just started to flash, there's no way you put over 11.5 gallons in. I second the suggestion to try a different gas station, and then try to use that station from then on. Plus, find a way to fill up to the exact level each time. For instance, when I fill up, as soon as I get to the 9 gallon mark I slow the pump down to ensure that it fills up to the click without clicking prematurely due to splash or foam. I would also argue against filling past the click, for a variety of reasons, not the least of which is overspill which could damage your paint as well as the environment.

WRBlue · 08-10-2007, 11:33 AM

Quote:

Originally Posted by Pars

Try another gas station, perhaps their pumps are better calibrated.

0.05 G takes up 11.5 in^3.
The chances a gas station will take a chance with a less than 0.5% overcharge - because the pumps are checked often by state agencies for calibration - are much much smaller than Toyota not making the tank EXACTLY 11.5g... Especially when gas stations make next to no profit on the fuel they sell...

nsmitchell · 08-10-2007, 11:33 AM

Quote:

Originally Posted by swng

Re Posts #1,3, and 5 above:
My practical experience is if you ignore the click of the nozzle and try hard to overfill, it is possible to "squeeze" more than the max volume specified in the user manual into the tank. It may not be advisable to do so though. Please see:http://www.epa.gov/donttopoff/

Thank you! DON'T TOP OFF!

:SherryBerry, you have an indicator light (MainT Req) that tells you when to change the oil. Every 5000 miles. You just reset it. http://www.yarisworld.com/forums/sho...09&postcount=5

sherryberry · 08-10-2007, 12:38 PM

oh i know the indicator light is there. I just like to look at the miles as well and it gives me an idea that it's coming up soon.

churp · 08-10-2007, 01:06 PM

About 3-5 years ago a few gas stations were found to have black market chips in their pumps (I believe Cali but not sure??) that would show more gas than pumped, only between the full gallon divisions (say 5.4 gallons actual instead of 5.5 shown on the pump...electronics are wonderful!!!!!). They were getting away with it because the inspectors only checked at the full gallon marks.....has our government changed their inspection techniques...and do the stations know when they'll be inspected? Easy way to make up to an extra 30 cents on a fillup......I'd change gas stations.

Pars · 08-10-2007, 11:10 PM

Back in the 80th, I used to notice some very suspicious result from my fill-up. I actually went to complain to the manager on one occasion cause the fill-up was more then my tanks capacity. Back then, most of the cars on the road were these gas guzzling V8 and being a few litre off wasn't a big deal. But I was driving a new 1.6L Toyota and a few Litres would take me to school and back. Since then, I've been very selective about where I go to fill-up.

EggMan · 08-11-2007, 10:10 PM

The owners manual (page 296) states 11.1 Gal capacity for my Liftback.

08-09-2007, 11:11 PM	#5
sherryberry Drives: 07 Blazing Blue Yaris Join Date: Jun 2007 Location: Illinois Posts: 1,305	i'm confused as how you got that many gallons of gas into that gas tank as well. and like petesimac says, use your odometer. that's what it's there for. I use trip A to calculate MPG and trip B to calculate next oil change __________________ Don't Milk the Cat! -Said by me during a game of Cranium.

08-09-2007, 11:34 PM	#9
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	Some useful experience shared here: http://www.yarisworld.com/forums/sho...+tank+capacity Not every post there is relevant to the present topic though.

08-10-2007, 10:39 AM	#11
sherryberry Drives: 07 Blazing Blue Yaris Join Date: Jun 2007 Location: Illinois Posts: 1,305	wow i didn't know that some gas stations does that to rip people off. I don't think i've had an issue where the amount of gas i put in is more than the amount of the tank. __________________ Don't Milk the Cat! -Said by me during a game of Cranium.

08-10-2007, 12:38 PM	#15
sherryberry Drives: 07 Blazing Blue Yaris Join Date: Jun 2007 Location: Illinois Posts: 1,305	oh i know the indicator light is there. I just like to look at the miles as well and it gives me an idea that it's coming up soon. __________________ Don't Milk the Cat! -Said by me during a game of Cranium.

08-10-2007, 01:06 PM	#16
churp Clean and (dis)Functional View User's Garage Drives: Yaris 2dr--Black Betty Join Date: Mar 2007 Location: Tropical Minnesota Posts: 562	About 3-5 years ago a few gas stations were found to have black market chips in their pumps (I believe Cali but not sure??) that would show more gas than pumped, only between the full gallon divisions (say 5.4 gallons actual instead of 5.5 shown on the pump...electronics are wonderful!!!!!). They were getting away with it because the inspectors only checked at the full gallon marks.....has our government changed their inspection techniques...and do the stations know when they'll be inspected? Easy way to make up to an extra 30 cents on a fillup......I'd change gas stations. __________________ ____________ Old School Cobble Jockey

08-09-2007, 09:47 PM	#1
YarisBlazer Drives: 2007 Yaris Liftback Join Date: Jul 2006 Location: temple terrace fl Posts: 52	Am I calculating MPG correctly? Ok, this is the second time I've tried to figure out my MPG; I want to make sure I am doing this right; this is how I calculate it: Odometer reading now minus odomter reading at last fill-up divided by amount of gas I put in tank at this fill-up Of course I always fill it all the way to full I just filled up so today's equation is: 2623 (Odometer reading now at fill-up) - 2262 (Reading at last fill-up) ____ 361 divided by 11.551 gallons = 31.252 MPG Is this right? I am doing mostly city driving so I would like to get this up to at last 36 MPG if I can; I'm in Florida so must run the A/C while driving. Thanks for any input; my last reading was 32 MPG.

08-09-2007, 10:44 PM	#2
xed Drives: '08 Polar White 3dr Join Date: Jun 2007 Location: NC USA Posts: 79	Yep you got it.

08-09-2007, 10:52 PM	#3
petesimac Drives: Yaris LB Join Date: May 2007 Location: Pittsburgh Posts: 89	Only thing is, the tank only has a capacity of 11.5 gallons; how did you cram in more? Are you running the car all the way until it is on fumes? If so, that could be part of the problem. I've heard of Yari that run out of gas (or perhaps come close) needing to be reset afterwards. I fill up as soon as the second to last bar disappears, leaving the one, flashing bar. At this point, my tank can only take just under 10 gallons to fill it up again. Oh, and instead of having to recalculate your miles, use your trip odometer instead. Everytime you fill up, press and hold the little black button near the trip odometer meeting until it goes back to 0; that'll leave you with one less equation to complete.

08-09-2007, 11:10 PM	#4
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	Please refer to Post #1350 of the Fuel Economy Thread here for some useful mpg calculators:http://www.yarisworld.com/forums/sho...p?t=38&page=90 There is another one in Post #1422 of the same thread.

08-09-2007, 11:20 PM	#7
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	Re Posts #1,3, and 5 above: My practical experience is if you ignore the click of the nozzle and try hard to overfill, it is possible to "squeeze" more than the max volume specified in the user manual into the tank. It may not be advisable to do so though. Please see:http://www.epa.gov/donttopoff/

08-10-2007, 11:10 PM	#17
Pars Drives: 07 Yaris Liftback Join Date: Aug 2006 Location: Toronto Posts: 418	Back in the 80th, I used to notice some very suspicious result from my fill-up. I actually went to complain to the manager on one occasion cause the fill-up was more then my tanks capacity. Back then, most of the cars on the road were these gas guzzling V8 and being a few litre off wasn't a big deal. But I was driving a new 1.6L Toyota and a few Litres would take me to school and back. Since then, I've been very selective about where I go to fill-up.

08-11-2007, 10:10 PM	#18
EggMan Drives: 2007 Yaris liftback Join Date: Jun 2007 Location: Columbus, Ohio Posts: 18	The owners manual (page 296) states 11.1 Gal capacity for my Liftback.

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