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post #1 of 5 (permalink) Old 04-08-2010, 10:35 PM Thread Starter
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I have a 2008 F-350 cclb,drw with 4.10 gears and spartan 210 tow and 250 tune. I get about the same now as when it was stock maybe 1 to 2 mpg different(12 to 14 stock).My question is do you think a gear vendor will help? I drive mostly highway at 70mph which is about 2150 to 2200 rpm.Also, how much will it reduce my rpm? Oh yeah, it's an auto....I know.... Thanks guys

2008 Job2 F-350 King Ranch cclb, Spartan,KEM,Banks,cai mod., powerstroker67s 4in Ceramic coated downpipe, 5in black mitre cut tip and bov from Rudy's
RCD cac pipe,MPD's billet ccv block,Recon,Retro 6k heads and fog's,
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post #2 of 5 (permalink) Old 04-09-2010, 01:26 AM
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Re: ????????

The GV will probably destroy your automatic, but that's just my experience. Maybe Redstroke will have better luck.

I've been working on this for ten years and I've found only three things that really improve MPG.

Change your driving habits
Reduce engine RPM at a given road speed
Clean up your aerodynamics

Those three things have taken me from 18 to 27 MPG. Sounds like a 50% improvement.

But it is a lot like racing. You gotta get serious to get results.

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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post #3 of 5 (permalink) Old 04-09-2010, 05:16 PM
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Re: ????????

Quote:
Originally Posted by Sahrens0202 View Post
I have a 2008 F-350 cclb,drw with 4.10 gears and spartan 210 tow and 250 tune. I get about the same now as when it was stock maybe 1 to 2 mpg different(12 to 14 stock).My question is do you think a gear vendor will help? I drive mostly highway at 70mph which is about 2150 to 2200 rpm.Also, how much will it reduce my rpm? Oh yeah, it's an auto....I know.... Thanks guys
Just a thought, and this comes from no experience, but try loading the stock, no dpf tune and see if that changes it. Most of the guys with Spartan claim 15-16 with SRW trucks, and a few claim 19-20.

2009 F-350 6.4L
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post #4 of 5 (permalink) Old 04-09-2010, 05:32 PM Thread Starter
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Re: ????????

Thanks for the info guys!!

2008 Job2 F-350 King Ranch cclb, Spartan,KEM,Banks,cai mod., powerstroker67s 4in Ceramic coated downpipe, 5in black mitre cut tip and bov from Rudy's
RCD cac pipe,MPD's billet ccv block,Recon,Retro 6k heads and fog's,
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post #5 of 5 (permalink) Old 04-14-2010, 10:24 PM
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Re: ????????

I have a hard time believing the 19-20 claims out of a tuned truck, just cause of the restraint required to drive it that way.
a good bed cap will help on the highway.
your 4.10's are probably hurting you. GV would help with this, but I keep hearing it'll kill an auto... haven't heard why this is.
Dually doesn't help. nor does the fact that your truck weighs 8000+ lbs.
start by accelerating at a snails pace. race the grandma in the civic next to you, but let her win .

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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