392 gas mileage

Punkindug

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Just drove my daughters stuff up to move in college today for senior year. Up thru the adirondack mountains in upstate NY. My previous JLUR w/ 3.6L averaged 18.1 on the sage exact trip. 1st trip with the 392 and got a whopping 20.9! How can that be??? Not even 1/4 of a tank 110 miles. WTF? Not near as much downshifting as the V6 so I figured the torque on the V8 helped? Up the mountains and down. Averaged 55mph, very humid for upstate NY today and 88 degrees. Running 91 octane non-ethanol. Rte 28 and 30 if anyone knows where that is.

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SSWIM

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Amazing is all I can say. I have never came close. Easy drive, 55-65MPH nets me around 16-17 MPG.

Sam
 

Monster1926

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MDS is nice fuel mileage wise but it also destroys cams.
 

XJfanatic

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Thinking some of that probably comes from coasting down hill. My 2.0T gets 21 normally on flat ground with the heavy ridge grapplers. In the hills it is closer to 23 due to all the time just coasting.
 

aldo98229

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See, honey? We need a big honking V8! It will save us money...!
 

graytrucks

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The 392 is quite good on the highway, as are most V8s (when maintaining steady speeds). I get high teens/low 20s in most highway situations. I’ve always gotten better highway MPG with more powerful engines. Local driving or high speed acceleration to pass is a different story…
 

supermike

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200 miles between fill up, wish we got a 35 gal tank.
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GATORB8

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I always thought it was weird, but I do a Charlotte - Knoxville run across the Blueridge/Smokies about once a month and always get better mileage in my Ram than I do on flat interstate. I think the V8 torque makes the climbs more efficient and then coasting down grade pulls the average up a lot.
 
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