I have been racking my brain trying to figure this out. My mom says i am A.D.D., so I can't think about it too long LOL

anyway, on my truck, the tires are TALLER than stock. When I drive, I know that my speedo off by about 4 miles/hour. When I am going 60, I am really going 64.

With that said, this would mean that my tripometer would read LESS miles than really occured, correct??

If so, can I just take and figure the percentage difference between the above 60/64 mph and apply it to the mileage I get out of a tank of gas?

I am simply trying to figure out my miles per gallon. As it stands I am getting 14.5 mpg. But, if I am getting more mileage out of a tank, I need to figure out how to get to it.

Yes mate. Youre going further than it says you are.

If, with your new tires, you are going 64 mph when your speedo reads 60, that's a +6.67% error. So if you drovve one hour at a constant 60 mph (by your speedometer) you actually traveled 64 miles. So, to figure your actual miles traveled you would have to increas the odometer reading by that same 6.67% and divide that figure by the gallons used.

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Yes, thanks that was the question I was asking. Thanks to the both of you.