mpg when going from stock to 35" tire - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 25 (permalink) Old 02-22-2009, 04:40 PM Thread Starter
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mpg when going from stock to 35" tire

alright i have a bone stock bdy/tire wize sd, i get about 17mpg hwy going 65 mph. now i want to put a leveling kit on it with 35" tires, now my gears are 4.10 so i figured the taller tire would lower the rpms enough to offset the heavier wieght and more rolling resistance of the bigger tire? am i way off here thinking this, by the way the tire i am lookin at getting is the 35x12.5 bfg all terrain.

2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
Php hydra chip PHP tuned! 4" exhaust, stock turbo(ww2, turbomaster wastage actuator, gutted ebpv), FRX, 160/30 sticks SB 1939-CB single clutch, home brew water setup for when i'm pulling hay through the mountains.
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post #2 of 25 (permalink) Old 02-22-2009, 05:25 PM
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Re: mpg when going from stock to 35" tire

I can get 17-18mpg with a 4" lift and 35'' bfg's, 3.73 gears, 6spd, thats if I drive very consevatively and go about 60-65mpg usually, but thats mostly only smaller local hwys. At 70 mph I think my rpms are around 1925 or so, I cant remember what they were at 60. With the way I usually drive, I get a pretty easy 15 or so out of it, but that is also with short trips that only halfway to work i'm just getting to op temps.
Hope this helps.

2002 F-250 handshaker Daily Driver
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post #3 of 25 (permalink) Old 02-23-2009, 12:29 AM
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Re: mpg when going from stock to 35" tire

Expect to lose 2 MPG when you put the big tires on it.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
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post #4 of 25 (permalink) Old 02-23-2009, 01:03 AM Thread Starter
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Re: mpg when going from stock to 35" tire

so would you sugjest a 33x10.50 i mean right now my rpms are to high at hyw speeds to get any decent mileage, only way to get my mpg above 18 is to stay under 65, i want to be able to go 70 and still see the mpg. mabey some cookie cutter 33s?

2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
Php hydra chip PHP tuned! 4" exhaust, stock turbo(ww2, turbomaster wastage actuator, gutted ebpv), FRX, 160/30 sticks SB 1939-CB single clutch, home brew water setup for when i'm pulling hay through the mountains.
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post #5 of 25 (permalink) Old 02-23-2009, 01:04 AM
 
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Re: mpg when going from stock to 35" tire

i get about 16ish at 65 on 35s.
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post #6 of 25 (permalink) Old 02-23-2009, 01:05 AM Thread Starter
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Re: mpg when going from stock to 35" tire

by the way what did you do to your truck engine wize to pull 27 mpg? i see you have it lowered and airdamed/bedcovered but what did you to to the engine? im guessin tuner but who did you use? thanks, also what do you think about me lowerin my 4x4 and throwin some 3.08s in it?

2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
Php hydra chip PHP tuned! 4" exhaust, stock turbo(ww2, turbomaster wastage actuator, gutted ebpv), FRX, 160/30 sticks SB 1939-CB single clutch, home brew water setup for when i'm pulling hay through the mountains.
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post #7 of 25 (permalink) Old 02-23-2009, 08:31 PM
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Re: mpg when going from stock to 35" tire

Most of Dave's stuff is aerodynamics, gearing, and most importantly driving habits.
I went up to 285/75's, Which are basically 33's, with a much more aggressive tread, and I lost 1.8 mpg. I've gained 1.6 of that back by even more conservative driving.

Dan
96 Powerstroke: 6637, downpipe to dump exhaust, 140v IDM and a shift kit.

84 Honda Sabre V65 1100: pipes, jet kit and new tires. Faster than I think I'll ever need.
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post #8 of 25 (permalink) Old 02-23-2009, 08:39 PM
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Re: mpg when going from stock to 35" tire

Jay,

out of curiosity, what are your rpms at say 60 65 70?

my truck at 60 the rpms are 1800 65-2000 70-2200

DieselPower1966

John
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post #9 of 25 (permalink) Old 02-23-2009, 11:36 PM Thread Starter
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Re: mpg when going from stock to 35" tire

yep mine are exactly the same as yours , i have 31.2 inch tall tires (measured with a tape) thats how i figured i have 4.10 gears.

2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
Php hydra chip PHP tuned! 4" exhaust, stock turbo(ww2, turbomaster wastage actuator, gutted ebpv), FRX, 160/30 sticks SB 1939-CB single clutch, home brew water setup for when i'm pulling hay through the mountains.
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post #10 of 25 (permalink) Old 02-23-2009, 11:41 PM
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Re: mpg when going from stock to 35" tire

I know the OBS is a little diff. But i lost about 2MPG with the 35" tire 4.10s

1997 F350 Crew Cab, 7.3, 4x4, 5SP Short Shift kit, 5" RSK SD V Code springs, DIY Intake, 5" Exhaust with 30" FTE Resinator, intercooled, TS chip.
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