3.55 vs. 4.10, which is better on the highway - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 10-01-2009, 12:49 PM Thread Starter
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3.55 vs. 4.10, which is better on the highway

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?
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post #2 of 15 Old 10-01-2009, 12:57 PM
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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


1997 Ford F250 4x4 extended cab long box
fpr shim
305/70/16 goodyear mtrs on stock wheels
3"dp to 4" straight pipe to a 6" tip .
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post #3 of 15 Old 10-01-2009, 01:02 PM
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also to add i have a 4x4 so you'll probably get better than i have


1997 Ford F250 4x4 extended cab long box
fpr shim
305/70/16 goodyear mtrs on stock wheels
3"dp to 4" straight pipe to a 6" tip .
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post #4 of 15 Old 10-01-2009, 01:16 PM
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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.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #5 of 15 Old 10-01-2009, 01:19 PM Thread Starter
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So you think 18 would be reasonable on the highway, if I wasn't pulling anything?
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post #6 of 15 Old 10-01-2009, 01:32 PM
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yeah, i think most average between 15 and 18 empty.

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

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #7 of 15 Old 10-01-2009, 03:17 PM
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You could go to 255/85/16 tires next time, gets you partway back to 3.55 without being very much wider than stock.
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post #8 of 15 Old 10-02-2009, 06:08 AM
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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.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #9 of 15 Old 10-02-2009, 09:36 AM Thread Starter
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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.
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post #10 of 15 Old 10-02-2009, 07:41 PM
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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
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