I've just got 1,200 miles on my 08 4x4 Ram, 6 speed manual. I got the basic quad cab w/o the tow package and think the rear-end ratio is 342. Then running on the highway, in 6th gear at 65-70 MPHthe engine is turning 1,900-2,000 RPMs andmy fuel computer indicates 14-15 mpg. If I drop to 5th, the RPMs jump to 2,500 and the computer shoots up to 19-20 mpg. 2,500 is only600 away from red-line. At 2500 the truck sounds like it's towing a bull dozer! Am I seeing right?

 

That computer has the nickname "lie-o-meter" for a reason!!!!!
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run the lower RPM's. . .you will get better mileage

 

I find that around 2000-2200 seems to be where I see the best milage. Above or below that range I can count on it dropping off slightly.

 

Don't believe the "Lie-o-Meter" mine is off by 5+ mpg all of the time.

 

That overhead meter is junk. Mine told me 17-18 all yesterday from driving over 400 miles non stop highway. Today, I filled up and did the math and I only got 16. I am at 4,800 miles.

 

I'm at 28K and I'm only getting around 15 empty (hand calculated). the Lie-O Meter is 4 mpg off consistently.

 

the more mileage you have the better the mpg will get.

 

Interesting....... I'll have to bust out and paper and pen

 

my overhead reads 22.1 and my actual is 17.8