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zogg's avatar
zogg
Explorer
Mar 03, 2015

Ram 2500 5.7 hemi mpg.....a bit disappointed

The other day we took a trip ftom southern illinois, through st louis, to southern Missouri...a couple of hundred miles each way.

Starting out I reset the mpg meter on the dash, and recorded 17.4-17.8 mpg driving at 62-65 mph going through st louis. Once we got out of town, I ran at 75 mph the rest of the way to our destination. The MPG continually dropped until it hit 14.3, which is where it stayed.

Going through southern Missouri is fairly hilly and the truck geared down quite often...more than expected.

On the return trip, I again reset the mpg meter and after about 30 miles at 75 mph, I was right back to 14.3 mpg.

A we approached st louis, we had to slow back down to 65 mph.....mpg came back up to 17.3 and we finished the trip at 17.6.

I never had a truck that would drop 3+ over a 10 mph range....surprising. we were totally unloaded in 2wd the whole trip. 

I am wondering how this compares with the 6.2 L engine in the same truck??????

I was kind of expecting about 3-5 mpg better from the 5.7 hemi
  • I loved my 2500 5.7 but the best mpg's I ever averaged was 13 overall with 3.73's. Also, make sure to hand calculate to make sure of your average mpg accuracy. It's a big, heavy, powerful truck and they drink some gas, doesn't matter if it is the 5.7, 6.4, 6.2 or 6.0. If you want good gas mileage in this wieght class you need to look at the diesels.
    If you averaged 17.6 mpg's overall that is pretty darn good, I am from St. Louis, Fenton to be exact and I know the hilly terrain you are talking about pretty well.
  • Well I've owned or had company trucks with just about every gasser offered except the new 6.4 Rams, 6.2 Chevy and 8.1 Chevy and I can say with certainty that every one of them averaged between 11 and 14mpg on the highway. Never drive slow enough to squeeze 17 out of anything with a gas V8 so your truck is right on par. Wouldn't expect the 5.7 to do much better than the 6.4 apples to apples. With today's fuel and ignition management, they all use about the same gas for the amount of hp required for the condition at hand.