what is killing my mpg??

[jonathancasey19]

x2 on anything over 2000rpm's. Seems to just plummet. With 285's and no lift w/ 4088 I saw 23mpg--65mph and now 35's it's around 19. I was pretty surprised at the adverse affect tire size had with respect to mileage. Believe it or not, I get my best mileage on my hot tune....weird

 

[RENODMAX]

That's because it has the most timing Jonathan

 

[KEVINL]

I was getting 18-19 with the 4094 the stock turbo can only give me 16mpg

 

[Chevy1925]

my truck cruising at 75 with the PPE on lvl 10 i usually average about 20-21 mph hand calc (dont have that fancy, incorrect DIC crap lol). This is with cruise control on, clean air fliter, all synthetic oils, new fuel filters, and no wind.

Course as soon as i hit the go pedal to pass someone up one of the hills all this balck stuff comes out the back and fuel mileage drops??? My mechanic and i were thinkin its runnin too rich and has lots of carbon build up :rofl::happy2:

 

[mmangels22]

Hand calculated as my post states. I have a stock turbo. Read through the thread.

Ok so I understand that however is this one highway occurence that you got 23 mpg? Because I do not believe you average 23 mpg you are either not being truthful or somethings being miscalculated.

 

[mmangels22]

that's similar to what I had steve. I believe you

Ok but he only stated single occurences not average mpg. You did not state single occurence you made it seem like you get it average which is misleading.

 

[RENODMAX]

This is my average mpg. He said his average is 19-21 which is what I'm referring to. I get 23 mpg on average hand calculated as I said. I'm tuning mitchs truck he'll report back.