Why does my mileage suck?

[off-roader]

Another factor is...

Another factor is your driving style. Realistically, the slower you accelerate and mor constant your speed, the better your mileage. An ex GF used to wonder about her gas mileage as well and I had to point out how her wanting to accelerate hard was the main cause of her mileage especially when I got 3-5mpg better mileage.

Of course, a fresh tune up is always good for mileage...

HTH

 

[Martinjmpr]

Mileage conversion...

Those "tire size calculations" will get you in the ballpark but if you really want to know the best way is to get an accurate GPS unit. Then set the trip meter on the GPS and the trip meter on your vehicle to zero. Drive at least 100 miles. Subtract the smaller number from the larger, then divide the difference by the odometer number (not the GPS number.) Now you know your "conversion factor."

When I did this with my 4runner, it worked out like this:

Odo reading: 101.4
GPS reading: 104.84
Difference: 3.44

3.44 / 101.4 = .0339 So for every mile my odo shows, I've actually gone 1.0339 miles. When I fill the tank I multiply the distance on the trip meter by 1.034 to get my true miles driven, then divide that by the number of gallons for my MPG.

EDITED TO ADD: Looking at the numbers (no, math was not my strong suite!) you can get the same result by dividing the larger number by the smaller one, too. 104.84 / 101.4 = 1.0339. So that's the simpler way to do it.

 

[off-roader]

I was trying to point out above that if you perform the following math instead...

104.84 / 101.4 = 1.0339

You arrive at your end figure more quickly. :ylsmoke: