5.7l Hemi MPG Disappointment - Hemi Truck Club
 
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Old 12-27-2011, 07:22 PM   #1
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I switched to a gasser, 06 5.7l hemi, in hopes of gaining dd mpg. My 6.0l Ford F350 Crew was getting 13-14 as DD and 10+ towing my Jeep for the weekend wheeling trips. I bought a 06 1500 Mega 4wd with the 5.7l hemi. I get the same mpg towing as what I expected from the other toter gassers I wheel with. But the dd is very disappointing. I'm getting 12+.
I know both are heavy vehicles, but I was expecting 16-18 as a dd.

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Old 12-27-2011, 07:22 PM   #2
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I switched to a gasser, 06 5.7l hemi, in hopes of gaining dd mpg. My 6.0l Ford F350 Crew was getting 13-14 as DD and 10+ towing my Jeep for the weekend wheeling trips. I bought a 06 1500 Mega 4wd with the 5.7l hemi. I get the same mpg towing as what I expected from the other toter gassers I wheel with. But the dd is very disappointing. I'm getting 12+.
I know both are heavy vehicles, but I was expecting 16-18 as a dd.
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Old 12-28-2011, 03:50 AM   #3
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Mega cabs are heavy trucks, essentially driving a gas F250 with the 5.4 around. Hard to beat diesels for mpg on a larger truck (crew cabs and such). Even my 2011 Reg cab is only 15-16 around town and I don't have to many traffic lights. 16-18 will sadly be more typical of your highway mpgs.
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Old 12-28-2011, 03:02 PM   #4
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If the truck is bone stock put tuner, a cold air kit, replace the factory Y pipe and put a better muffler on it.

Another other thing you need to look at is what gears are in there. I don't know what comes stock but if it has 3.55s with something that heavy they will hurt your mpg. I hope it has 4.10s or better.
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Old 12-28-2011, 06:43 PM   #5
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Sorry you are disappointed, but can't help to think you didn't research the Mega very well if you thought you were going to get any kind of mileage. Good luck
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Old 12-30-2011, 05:53 PM   #6
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Yep. Didn't research hard for the Mega. Had a friend that works at dealership. This came as a dealer swap with multiple vehicles, something like 12 or so.
I wanted another 'big' truck to tow my Jeep comfortably. Didn't weigh the F350, but probably by estimate, it weighed better than 9k. I'm hoping this Mega is lighter by some 2k+. I had a Bronco that I mod'd and wheeled before the TJ. It weighed 6200#! That was heavy for a trail rig.
All stock so far. It does need shocks/tires. Its only 1 month old for me. Yah, saw that y connection and really wanted to cut it out and that muffler is actually smaller than my apartment-sized Ford muffler. Been researching the CAI and not wanting to add 'tune' due to the extra costs of the fuel requirement. I got away from the diesel for the extra .80-$1 cost. Gear ratio is 3.73.
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