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Old 01-10-2013, 06:45 PM   #1 (permalink)
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Default MPG does not match miles driven

I know the MPGs are a little off on the screen but it usually shows 48-52 MPG but I only get about 400 miles on a tank of gas. I am not a mathematician but that doesn't add up.
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Old 01-10-2013, 07:11 PM   #2 (permalink)
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And how much gas do you put in after this 400 mile tank?

Some important info missing from this post.

Sam
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Old 01-10-2013, 07:15 PM   #3 (permalink)
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Just fill up twice, preferably at the same pump until the first click. That will give you a controlled amount of fuel that you can divide into the range you get. You can then see how accurate your computer is.
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Old 01-10-2013, 07:29 PM   #4 (permalink)
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Quote:
Originally Posted by samwichse View Post
And how much gas do you put in after this 400 mile tank?

Some important info missing from this post.

Sam
It was roughly 8 gallons
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Old 01-10-2013, 07:56 PM   #5 (permalink)
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Quote:
Originally Posted by radereb View Post
It was roughly 8 gallons
400 miles / 8 gallons = 50 miles/gallon.

Seems like it was dead on for you (most people it's ~2mpg too high.
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-MaxIMA, OBDIIC&C, IMAC&C, Lower grill block

RIP 2000 Insight, 40k miles @ 69.2 mpg
2000 Insight, AKA "The Basket Case" or "The Go Pod" @185k miles @ 63.5 mpg
-IMAC&C, OBDIIC&C, Scott's aero panel, grid charger, cheapo sound system
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Old 01-10-2013, 08:36 PM   #6 (permalink)
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400 miles / 8 gallons = 50 miles/gallon.

Seems like it was dead on for you (most people it's ~2mpg too high.
Do you ever get close to your range? Mine usually says 550 miles or so and I never come close.
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Old 01-10-2013, 09:01 PM   #7 (permalink)
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I don't have a range, I've got a 2004 Civic Hybrid. All I get is the instant/average MPG.

You could get close to that range if you ran your tank completely bone dry.

With a 10.6 gallon tank, 50 mpg gets you 530 miles until your car rolls to a stop. I always fill my tank with about 1.5-2 gallons left in the tank, cause I like some safety margin.

Sam

EDIT: My car has a larger 13.2 gallon tank, I usually put around 11 gallons in it at 500-550 miles (45-50 mpg)
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2004 Honda Civic Hybrid "Eeyore" @ 49 mpg
-MaxIMA, OBDIIC&C, IMAC&C, Lower grill block

RIP 2000 Insight, 40k miles @ 69.2 mpg
2000 Insight, AKA "The Basket Case" or "The Go Pod" @185k miles @ 63.5 mpg
-IMAC&C, OBDIIC&C, Scott's aero panel, grid charger, cheapo sound system

Last edited by samwichse; 01-10-2013 at 09:06 PM.
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Old 01-11-2013, 05:37 PM   #8 (permalink)
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A little disappointed, just filled up the tank for the 2nd time so I could get the exact MPG. Got 45.4 MPG w/ a fill up 7.299 gallons. Pretty good considering it was all city, no HWY... but the MID was showing a tank avg of 49.7.

I guess I cant complain too much, I am beating the EPA's estimates by a good bit!
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Old 01-12-2013, 12:57 PM   #9 (permalink)
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Yeah, I never trust the dash gauge. Mine hasn't been accurate on a single tank since I purchased my insight. I track my fuel mileage on Fuelly because I can text my fillups in and it keeps track for me. My average this winter has been about 42.6. It's been pretty cold here and driving around in two snow storms sent those two tanks into the high 30s.

However, all of my tanks on the MID have reported in somewhere in the 46 to 50 range without fail.
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Old 01-13-2013, 01:04 PM   #10 (permalink)
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Think I may have caught part of the problem for the lower MPG. I checked my tire pressure today and the front tires are at 33 and 31PSI. Rear tires are at 30 and 30.5. Gonna up them for sure, hopefully that'll help a bit. I've looked at some of the tire pressure threads. What would you recommend putting mine to? I have the stock 2010 dunlops
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