I'm driving a 2010 2500 and getting 14.5-15.0 right now with 2,200 miles on it---seems to be getting better and i'll be switching to synthetic at the first oil change.

 

2010 Ram 1500 4x4
Extended Cab, Hemi, 3.55 gears
3200 miles
Honda ST1300 in the bed (760 lbs) + all the other extras that go to Daytona bike week including wife (115 lbs shhhhh!)
Type of driving: Rt.95 all the way down (BORING!), MPH Range: Mostly 60-73 depending on speed limit, we behaved.
Overall avg mpg for entire trip with no reset of computer: 16.1 mpg.
IMO very happy with that number.

 

I just did a nice long trip for the first time really testing mileage.

Driving speed was 55-59 on hwy and 62 on freeway. Anything above that and I can't keep it in 4 cylinder very well. I had 19.5 on the computer and 19.25 by hand. So pretty good. I was babying the heck out of it 100% of the time trying to squeeze every last drop.

No mods since last post. Basically a stock crew cab hemi.

I think 20++ with MY truck is unrealistic. Maybe on a dead calm day with flat roads running under 60mph. According to the computer I get the best mileage at about 40-45 mpg (22 on the computer).

 

I have a few more miles on my 09 than most I have seen posted so here goes:
Year - 09
Model -1500 TRX4 CC 4 x 4
Engine - 5.7
Gears...3:92
Tires-LT275/70-17 (Stock Goodyear POS tires, have another belt separating)
Highway percent - 50
City percent - 50
Location -Arkansas
Octane - 89
Hand or computer calc - Computer
Miles on truck - 13800
MPG - 16.2
Mods - none

Intersting note, since the first oil change I have run Mobile 1 factory recommended weight and changed the oil at 6000 miles. After 12000 mile oil change my fuel mileage went up by almost 3 miles per gallon. Prior to 12000 mile change from day 1, I averaged 13.4 mpg by the computer, after 12000 mile change I have averaged 16.2, haven't reset the computer since my 12000 mile oil change and haven't changed my driving habits.

 

Took a trip yesterday from Dayton to Cincinnati and back. I75 with the flow of the traffic. Overall 20.2 mpg
Year - 09
Model -1500 R/T
Engine - 5.7
Gears...4.10:1
Tires - Stock Goodyear Wrangler HP 20"
Highway percent - 80
City percent - 20
Location -Ohio
Octane - 89 Valero
Hand or computer calc - Computer
Miles on truck - 2200
MPG - 20.2
Mods - none

 

Year - 10
Model -2500 SLT Crew Cab 4 x 4 Big Horn Long Box
Engine - 5.7
Gears...3:92s
Tires-17
Highway percent - 50
City/Off-road percent - 50
Location -Wyoming
Octane - 91
Hand or computer calc - computer
Miles on truck - up to 1200
Highway MPG - 15 to 17
City/Off-road MPG - 12 to 13
Average MPG - 14.5
Mods - none

 

Year - 10
Model -1500 CC Sport 4 x 4
Engine - Hemi
Gears...3:55
Tires-stock 20's
Highway percent - 10
City percent - 90
Location -Tx
Octane - 96
Hand or computer calc - both
Miles on truck - 300
MPG - 14.6 computer
14.03 hand calculations
Mods - none

 

Umm that would be 86 octane not 96!!!!!

 

So far I am up to page 7 and there isn't a single diesel, is there another diesel section?. I only have 200 miles on my diesel and I haven't fueled up yet

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I read all 17 pages and not a single diesel

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Whoops I am new here and just found the diesel section, I'll check the MPGs over there

 

Model - Ram 2500 hemi 2wd
Engine - 5.7
Gears...3.73
Tires-stock bfg tires on 17x8.5 vtec 8 lug
Highway percent - 50
City percent - 50
Location -texas
Octane - 89
Hand or computer calc - Computer
Miles on truck - 16,800
MPG - 16
Mods - Diablo sport program on 87 up tune(modified), full custom true dual exhaust, k&n filter in stock intake, also wheels are lighter than stock, they are 26 pounds a piece.