Re: OT: 6.5 Chevy better MPG's????

Posted by jdemaris on April 23, 2006 at 18:58:15 from (66.218.24.154):

In Reply to: OT: 6.5 Chevy better MPG's???? posted by Tx Jim on April 23, 2006 at 10:27:25:

I can't offer much useful advice - but - I do know that the 6.5s could differ quite a bit depending on what truck package and what year. In the heavier trucks, GM was able to turn the fuel delivery up quite a bit and still meet emmissions requirements - and in those trucks fuel mileage was pretty bad if not awful. My neighbor has one he bought new, dual wheels, and he gets 10 - 11 highway. You can tell by your engine sticker and the horsepower rating.
I'm always fooling with diesel trucks - I've got a dozen of them. All GM and Ford - I never had a Dodge Cummins yet. Best mileage out of anything I've owned was the 6.2. My 82 1/2 4WD with 6.2 and four-speed stick with overdrive can get 24 MPG on a flat highway. I've got GM 6.2s, 6.5s, and Ford/IH 6.9s, 7.3 NAs, and a 7.3 IDI turbo. They all get pretty much the same mileage when being worked hard - but empty ??? My 85 Ford F250 ex-cab 4WD with 6.9 gets 11-12 MPG cruising a flat highway empty at 55 - 65 MPH - it doesn't seem to make sense. My 3/4 ton 4WD Suburban with 6.2 can get just about 20 MPG going the same speed and turning the same RPMs. It's geared the same as the 85 Ford and both have three-speed automatics. And, the Ford only had 65K miles on it, whereas my 6.2 Suburban has over 500,000 and never been apart (but it's eatin a lot of oil).
I've got a friend with a fairly new Chevy 3/4 ton 4WD with the newer Japanese diesel Duramax, and he's very disappointed. It is setup exactly the same as his 92 Dodge with a Cummins. His new chevy gets 13-14 MPG empty on a flat highway, whereas his older Dodge gets a consistent 18 MPG. Also, the farmer next door to me has a brand new Dodge 3/4 ton 4WD Cummins HO engine, and he claims to get 22 MPG. I'm not saying I believe it yet, but it sounds like a good story.

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