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post #1 of 8 Old 04-20-2013, 07:15 AM Thread Starter
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tires for better fuel economy

I'm going to be getting 18in wheels in the near future. I'm looking to get better fuel economy when changing my tires. I'm looking at 275x60Rx18s or 285x65rx18s Nitto terra grapplers. Which tire size should give me better fuel economy?

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

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post #2 of 8 Old 04-20-2013, 07:19 AM
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The 275 will be lighter, therefore, better mileage. How noticable...probably not much. Get the 285, they will look better!

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post #3 of 8 Old 04-20-2013, 07:20 AM
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Your 275s will give you sightly better bc there is less friction involved and a slightly smaller tire meaning less weight. Now, how much will it make a difference? Being that they are that little of difference (.5" wider and 1" in diameter) it probably will not make much of a difference at all that could be noticed, so personal preference on what you like.. my .02

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post #4 of 8 Old 04-20-2013, 07:46 AM Thread Starter
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When I had 285s on my truck it seemed like I was getting better fuel economy than on the stock size tires.

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

CAROLINA GRAY BOY
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post #5 of 8 Old 04-20-2013, 08:08 AM
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A 20" rim weighs 10lbs more than an identical 17" rim
A 35x12.5r20 weighs 10lbs more than a 35x12.5r17 of the same mfg.

Stick with the 18s you have and that will help too.
I would go with the 285 if I were you, I believe the improvement in effect gear ratio will offset the added weight and look way better.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
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I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #6 of 8 Old 04-20-2013, 08:11 AM Thread Starter
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I have 16s on it now will be going to 18s

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

CAROLINA GRAY BOY
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post #7 of 8 Old 04-20-2013, 08:53 AM
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Right on! What I like about 18's is there seems to a lot of available sizes.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
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I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #8 of 8 Old 04-20-2013, 09:06 AM Thread Starter
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yea I think I'm going with the black n milled rockstars with 285x65r18s

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

CAROLINA GRAY BOY
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