3.55 vs. 4.10, which is better on the highway

[tftimm]

The truck is all stock, stock tire size, etc. Which will give me better gas mileage on the highway, that is without pulling anything? What should I expect, its a 1997 2WD crew cab?

[7.3Lstroker]

my truck has 3.55 and when i had my stock tires k&n intake and 5in. exhaust i was getting between 19-21 mpg

[7.3Lstroker]

also to add i have a 4x4 so you'll probably get better than i have

[ridiculously_necessary]

i have a 4.10 and would like a 3.55. i got 17 last check, i was shocked. i assumed about 14, i dont have intake and exaust yet either.

[tftimm]

So you think 18 would be reasonable on the highway, if I wasn't pulling anything?

[ridiculously_necessary]

yeah, i think most average between 15 and 18 empty.

after seeign 17 i can wait to get to my intake and exaust.

[Garbage_Mechanic]

You could go to 255/85/16 tires next time, gets you partway back to 3.55 without being very much wider than stock.

[ridiculously_necessary]

that what i wanted to do, but the shop said they couldnt install any tire size otehr than stock, liability i assume. it hacked me off but i couldnt complain becase the price was awesome. i would like 265/80/16 or something around there.

[tftimm]

So it would be ok if I ran 265/75R16's with 3.55 gears? I'm not looking to pull much, and when I do it will be little. I'll be doing about 90% highway driving.

Also, with 265/75's, wouldy you mount them on an 8" or 8.5" wheel? I don't like it when the wheel is as wide as the tire, I think that looks bad. I'm leaning toward an 8" wheel.

[Nitro41]

I am gettin 17 mpg. not seein highway, but a few decent stretches of road on my way to school 4 days a week. I'll run it about 5-6 minutes stright at 2100-2200 rpm with my 4.10's

other then that, its city. I have a 5 speed 4x4. Im pleased with the MPG, figuring, i stick my foot in it quite a bit. I have a intake, open downpipe, and 15.6k mod. 235 tires