F350 Gift
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Mountain Pass
Joined: Sep 2004
Posts: 249
Likes: 2
From: AZ
F350 Gift
Just inherited an 1990 F350 4x4 automatic lwb regular cab with 460 engine. It is quite a climbing and torque beast. Has 173,000 mostly hwy miles and still is very strong. Gas mileage is 7.5 - 9.5. Is this about all it will get? It is mostly in town in a rural AZ area. It also has 4.10L gears. Thanks for any response.
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
That seems a little low. But if it's mostly town driving it's probably about right. I get 9-10 with my F-250 CCSB 4WD 460, E4OD, 4.10 gears. That's "suburban commuting". A lot of short freeway drives with the rest around town. It goes up to a solid 10 on the freeway 
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
Youve got a c6 I believe. No od button, right. You'll lose a couple mpg without the lockup converter and overdrive the e4od offers. The c6 is less prone to problems and way cheaper to rebuild though.
Posting Guru
Joined: Sep 2011
Posts: 1,409
Likes: 0
From: Clitherall, MN.
That's about as good as it gets for the most part. Might try a good tune up and push the timing ahead a degree or two. Not sure advancing the timing will help but you can always set it back. I had a 75 3/4 ton and got 10 pretty consistently. It had a 3.73 rear.
Elder User
Joined: Nov 2013
Posts: 524
Likes: 0
From: Maryland
I believe by 1990 all of the heavy duty trucks had the E4OD as the stock auto trans, but unless it's a bare bones model I doubt it has the C6. The E4OD with 4.10s are a real good torque/mileage balance
Thread Starter
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Mountain Pass
Joined: Sep 2004
Posts: 249
Likes: 2
From: AZ
It does have the E4OD. I have changed the cap and rotor, planning to do the plugs, air filter, fuel filter next, plug wires still look new.
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