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Oct 1, 2012 | 04:39 PM

#31

DIYMechanic

Post Fiend

Joined: Dec 2010

Posts: 10,121

Likes: 3

From: Orrville, Ohio

Quote:

Originally Posted by nossliw

17.5 hand calced every tank if any town driving is involved, long straight trips 18.5 - 19 mpg at 65-70 mph... Towing 8k+ 11-12. I have a chip but untill I get a few things cleared up I have ran this on the stock tune since I bought the truck and played with the chip mpgs...

How many miles are on this truck?

Oct 1, 2012 | 05:12 PM

#32

nossliw

Cargo Master

Joined: Nov 2010

Posts: 2,797

Likes: 10

122k bought with 114k, 4.10s and 285s with a stick. Stock injectors

Oct 1, 2012 | 05:26 PM

#33

Red97350

Laughing Gas

Joined: Oct 2009

Posts: 882

Likes: 11

From: Eastern CT

The few times I've figured my mileage I've gotten about 16 around town and about 19 on the highway. Driving like a grandma, not too much hot rodding. Towing about 5000-6000 lbs, I think I got about 10mpg. Stock except for 6637. 171k, 4.10's.

Red

Oct 1, 2012 | 11:43 PM

#34

BuckHammer

Cargo Master

Joined: Jul 2010

Posts: 3,014

Likes: 115

Quote:

Originally Posted by glovemeister

I honestly don't know why with 265s you aren't getting more, maybe go 285s lol?

Well, a LT235/85R16E, which is the stock size, is about the same diameter as the LT265/75R16E. The difference between the two is that the LT265/75R16E is a little wider. If anything, I would expect to lose some fuel economy going from a LT235/85R16E to a LT265/75R16E.

Here's a link that will help everybody visualize tire size changes:
Tire Size Calculator

Oct 6, 2012 | 09:26 PM

#35

idaho211

Tuned

Joined: Nov 2003

Posts: 491

Likes: 6

From: Eastern Washington

I have a 97 f250 4x4, not chipped I usually get about 17 mpg highway. I am running 235/85/R16's. Can't seem to get any better mileage. It has around 57,000 mi. With diesel at $4.33 a gallon I haven't been driving it much.

Oct 6, 2012 | 10:49 PM

#36

Dutch Semi

Senior User

Joined: Jun 2011

Posts: 182

Likes: 0

I run 285's with 4:10's and get 16-17 mpg's empty and about 13 mpg towing 6000lbs. That is with an auto tranny and the common fuel leak. My best mileage either way is with a tune in.

-Joseph

Oct 9, 2012 | 10:52 PM

#37

Dr. Johnson

More Turbo

Joined: Nov 2011

Posts: 508

Likes: 0

From: PNW

I have a 97 CCLB lifted 35's auto no tune, AFE intake, straight pipe and get 10.5-12 city and 12.5-13 hwy. driving pretty easy - alignment is dead nuts, the truck is just cantankerous.

Oct 10, 2012 | 10:31 AM

#38

fordman67

Hotshot

Joined: Dec 2005

Posts: 14,377

Likes: 609

From: evansville in

I do 17 around town.285's 3"and rsk.3"dp4" straight.6637 .no tune or inj.3.55 gears...
But only 17.5 highway .....cant figure why that is not better.with the obligatory fuel leak....argh :-(