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Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


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  #1  
Old 03-06-2011, 11:18 PM
mikk mikk is offline
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Default average MPG for hemi motor 5.7?

just wondering what people are averging with this motor?
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Old 03-06-2011, 11:23 PM
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winter -12 city max .....16 highway
Summer my avg between both was 15 mpg and if i reset the trip highway would sit 18+ most trips. Only have seen 20 a couple times on flat land in cruise control at 100km/hr. There are people with the 2010 claiming to get avgs in the 20's i just dont belive that lol. Lets face it this engine just wasn't produced to achieve fuel mileage.
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Old 03-07-2011, 12:03 PM
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Depends on how you drive it. Maybe 20 on the highway and 14-15 in town. Also depends on the weight of your right foot.
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Old 03-07-2011, 03:45 PM
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geting 9-12 mpg in city (winter) on average highway only been a few times but 15 -18 is my guess (winter) only been driving this 1 a couple of months .
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Old 03-07-2011, 04:25 PM
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355 gears vs 392 is going to make a big difference. I could imagine 355's getting 20 mpg average. I get 16 to 18 with 392's in SW VA (mountains)
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Old 03-07-2011, 05:25 PM
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With 3.92 gears, winter weather, and yes mine is a crewcab 4x4, I average 12.6 mpg, hand calculated on the past 9 tanks of gas.
Some of that is towing my 7,000 pound trailer though.
I really have no idea what it gets on just a HWY trip, but a guess is 17ish.
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Old 03-07-2011, 07:00 PM
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I have 2011 5.7 hemi 4X2 sport with 3.92 limited slip rear and have been averging 18.5 overall 75% hwy 25% city. I have 2000 miles on the truck and the mileage seems to be increasing alittle with each tank. I guess due to break-in, I do have a bed cover on the truck but all stock other wise. I am going to add a air intake and exhaust soon. If I can average 20 mpg out of this truck I think that would be incredible.
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Old 04-19-2011, 02:29 PM
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I'm at 8.5 with 35in mud grapplers
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Old 04-19-2011, 03:06 PM
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12 in town 15 on highway
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Old 04-19-2011, 03:44 PM
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It will depend on the generation of truck to some degree too, with different aerodynamics and such. I have 3.55's and I get about 15-16 in town and 18-20 on highway trips.
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