correct me if i am wrong. just did the math 19 gal in 210 miles is around 11 miles to the gallon i do have 35 and i belive 3.73s i drive around 40 miles a day. thought i would get better milage than that. did the ebp and that was clean, could it be the cps i have my DP tunner set on 60e for the whole time to test, that was hard.every thing seemes to be working good no trany slippage good boost no od issues any ideas.

 

come on is it my foot

 

That is bad mpg. You say you have good boost, what is your boost at wot? Is your up-pipes leaking? All boots good and tight? Did you break the egg under the pedal?

 

boost is around 25 to 30 in 120r before the test, and up to 20 or so in 60e. no soot on up pipes and all boots tight checked by presure test last weekend when i did a foile delete. ? egg ?? thank you for the responce

 

Have you had your speedometer adjusted for the larger tires? If you didn't, you are showing less miles on the odometer then you are traveling.

EDIT: That is good boost.

 

that could possibly be my issue. with out changing the speedo would i be able to calcuate the correct M.P.G.s

 

You can if you have a GPS to plot your miles. There may be a way to calc. mpg with a tire size, but I don't know. Tire pressure makes a difference also. When was the last time you changed your fuel filter, and changed the oil? They can effect your mpg.

 

thanks i will give that try

 

I don't know if it's the most accurate way, but figure out how far off your speedo is from your actual speed. Figure out what that percentage is, than add that to what miles you rack up.
It ought to give you a rough idea anyway.

 

Here ya go- this'll figure out your true speed with different tires

http://www.barretire.com/calculator.htm

 

Here ya go- this'll figure out your true speed with different tires

Tire Size Calculator great for converting tire sizes.

 

Tire diameter is going to only accout for few percetage points. He looks to be missing 25%+ worth of mpg. 20 psi in 60E during the mileage test?? I think the egg is broken badly. Try that test without exceeding 2000 RPM...if you can.