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Discussion Starter · #1 ·
What kind of fuel economy are people with 2011 Ram's, 5.7 HEMI's around town and out on the highways, getting with 3:92 gears.
Own a 2011 Longhorn, with 3:55's, 5.7 HEMI. Get 13.8 MPG around town and 20.4 over the road at 70-75 MPH. That's with a stubby pencil check during fill ups at the gas pumps. Just wondering? :4-dontknow:
 

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well from what I've read (cause I was wanting to do the same thing) it's only a couple MPG better in down....a couple less on the highway
 

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I'm almost 100% city driving and have the 3.92 gears. I've kept track of my mileage by the EVIC and by pencil since I've bought it. I'm around 10-12 mpg. Truck just passed 3500 miles and I also put a tonneau on it and I just happened to check it today via the EVIC and I'm at 13.9.
 

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My 2010 4x4 with 3:92's was rated 13cty 18hwy and thats pretty accurate. A co worker has a 2011 with 3:55's his was rated for 14cty 19 hwy and he says thats a bout what he gets....Not much difference.
 

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For little gains, the cost to change the ratio is too expensive and no net $ gains will be realized. Keep it as it is.
 

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Discussion Starter · #6 ·
3:92's X 3:55's-MPG

I agree, High cost for gear change, too little MPG to gain. EPA Fuel Economy Estimates on window sticker state 10 to 16 in city, and 15 to 23 on highway. Chrysler engineer's must be smoking some good stuff to get the high end of that mileage. I think 13 to 14 in city and 19 to 21 on highway is more realistic.
Thanks for the reply's forum member's.
 

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i have the 3.55 gear, in my rural area, very little stop and go, i average betweeen 16.5 and 17 with the winter fuel e blend . on a good hwy run, rt 287 to 78, went to cabellas, filled up right before getting on hwy and as soon as i got off, avg. 20.7. all hand calc. few weeks ago, stuck in traffic due to accident about 8 miles up the road, lots of idling and stop and go, evic showed 7.4 mpg. before you all call bs, i have the "lil" sport, rcsb, with 4wd. according to daughter, i drive like grandpa.
 

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I can see it. I do 85% hwy driving (24 mile one way trip to work) and I routinely avg high 18s to low 19s depending on traffic.
 

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According to Gas Cubby app, 14.90 mpg over 11930.0 miles. About half city, half highway (65-75 mph with rolling hills). Best tank which was all rural (mostly highway, some farm to market, 70-80 mph: 16.56 mpg.

Worst tank, 13.48 mpg, almost all city, winding and hilly roads, moderate to light traffic (NW Austin, not in rush hour).

If you have flat, straight highway, no wind, no traffic, cruise set at 60mph, you might see a real 20 mpg.

2WD 3.92 5.7

HTH
 

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These are all EVIC numbers and I have 2300 miles on mine so prob not broken it yet. I do mostly city driving and get 12mpg. On the highway I have seen 20 mpg.

I love my 3.92's but I don't really know what 3:55'sfeel like.
 
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