buying new tires but its a fuel econ question - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 3 (permalink) Old 12-03-2011, 08:21 PM Thread Starter
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buying new tires but its a fuel econ question

OK I have 325/60 18's and am wondering if going to a bigger/taller tire will help fuel millage or not?


2006 F250 with 35x13.50 18 MTZ'S, S&B intake, Sinister egr delete, banks CAC tube with intake, blue spring upgrade, high idle switch, ccv mod, fp gauge, cat/muffler delete, 6" rough country lift, SCT tuned by RCD, RCD 155/30% injectors, Airdog 100. 9.18 1/8th mile.
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post #2 of 3 (permalink) Old 12-04-2011, 05:13 PM
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Re: buying new tires but its a fuel econ question

I tried it to help my overall gear ratio on my E350 bus. Went from a 225/75R16 to a 235/85R16, and my mileage went down.

I think there are several factors. First, the tire are usually heavier as a result of the extra size. Next, because one is going to a taller tire, the vehicle has more air moving under it that further disturbs the aerodynamics beyond what traveling at the same speed while using less RPM's.

On my current E350 van, I might consider going to a narrower tire with about the same overall height (245/75R16 to a 215/85R16). Haven't made the decision yet as I don't really need new tires right now.

2005 E350 6.0PSD
2003 Excursion Limited 4WD 7.3PSD - Sold
1996 E350SD dually 7.3PSD - Gone!

2002 VW Jetta TDI - stock
2007 Escape Hybrid
1999 Kaw KLR650 - 17/42 gearing
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post #3 of 3 (permalink) Old 12-05-2011, 12:57 AM
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Re: buying new tires but its a fuel econ question

Going to a bigger OD tire will reduce your MPG.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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