I was just wondering what fellow 7.4 and 8.1 litre owners have got from a full tank, best and worst.

I have a full size dually and just got 170miles from a full tank! I think i'll have to take the lead out my boots and give her a service!

Whats the best anyone has got? I'm thinking of driving real lite for a tankfull and seeing how it goes. Problem is all i do is city driving up and down hills :(

-Craig

hi i have an 03 2500hd with 8.1 shotbed so i only have 26 gallon tank dont get much past 220mi city driving before looking for gas station. but have got as much as 300mi highway running dry.
i have 3:73 rearend i belive the 3500 come with 4.10 gears im sure that makes big differance :cheers:

oh man 220 sounds really good to me. i have a 1500 with a 350 and 26 gallon tank rarely ever gets me over 225.

Hey some interesting news here, i've been driving her real soft, not really going over 1500rpm if i can help it and from a quarter tank i've got just over 80 miles!

This might get me 320-330 miles city driving (average speed about 11mph). I've also kept the tail gate open while trying this, not sure if it makes much of a diffrence but some people swear by it.

If I can keep this up for the rest of the week i'll post what I managed to get, i'm pretty pleased and suprised so far.

-Craig

yeh....common logic would tell ya the less you push the accelerator the less gas you burn. and puttin the tailgate down isnt all false, it'll prolly get you an additional 5 miles out of a tank. To really get decent mpg gains get a free flowing intake and exhuast, air in air out.

Yeah its obvious, but its fun seeing just how much is possible, people keep asking me whats the best it can get and i'm planning to find out, I already have a free flowing intake etc. could do with getting a full service though.

-Craig

Good to try just to experiment but dont make a habit of it because sooner or later tryin to see how much you get out of a tank of gas will cost you a new fuel pump, especially if ur truck has some miles on it. The only thing that cools a pump and keeps it from overheating, only takes once for them to burn up, is the gas in the tank. I rarely ever let mine get much lower than a 1/4 tank if its handy to fill up.

I have a 1500 350 5.7 V8 and I got the throttle body spacer , Flowmaster exhaust and K&N filter( just the filter) and I am getting like 14 mpgI just got the cold air intake. I will install it tonight and then will test whats my new mpg. It supose to be better.I will let you guys know