Join Date: May 2011
Location: deptford, nj
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When talking MPG, quarter tanks and tank measures mean nothing.
The way to calculate what you are getting is to:
1 - Fill tank
2 - Note odometer reading
3 - Drive regularly
4 - Fill tank when necessary
5 - Note odometer reading and fuel pumped
6 - Take the distance and divide by fuel pumped (eg. 250 miles/10 gallons = 25 mpg)
7 - Observe result
For accuracy do that several times, will take a while.
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Unless you've done something to adjust your speedometer/odometer, I'd add one more step.
6.1 - multiply mpg in 6 by 1.15
If your stock tires were like mine, 225/70-15, your miles travelled may actually be 15% more than what your odometer is showing because of the increased tire diameter (and therefore, fewer revolutions per mile). I believe the ratio, new-tire-diameter/old-tire-diameter should be the difference.
I would think the larger, heavier tire/wheel combination would decrease mpg, but unless you calculate it like D22 stated and make any necessary adjustment for actual miles travelled, you won't really have a good idea of what your truck is doing.
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