2010 TRX4 Hemi
I get 13 mpg.
Volant intake, flow-master exhaust, BBK 90mm throttle body, 35x12.50 toyo mt's, had a diablosport InTune but threw that P.O.S. in the trash. 80% rural, 10% city, 10% interstate.
I use 87 octane. Higher octane does not make a difference, (in my elevation and temp)
My dad gets 12 in his 2013 2500 crew, and 12 in his 2010 Powerwagon.
The best I ever got in my 04 Cummins was 14.

 

On my 09 I was getting around 14, but with my 11 now im averaging 17 city and on my last trip to Virginia I ended up with 22 Highway.

 

Year: 11
Model: 2500 Mega Cab short bed
Engine: 5.7 Hemi
Highway percent: 90
City Percent: 10
Location: ATL
Octane: 87
Hand or COmputer calc: Computer
Miles on truck: 13,000
MPG: town 12.5, highway (best 14.9 - avg 13); towing RV 8.0
Mods: Jet Power Control Module (chip); no diff in mpg with or without

 

Pd $1.50 gal more for non-ethanol over 87 oct here in Edgewater,Fl. Tank was on empty when i fueled up.Ran a almost 300 miles round trip. 20 miles local the remainder highway. Head wind going tail wind returning. Both ways 75-80 mph. On trip going averaged 17.5 mpg, return same speed 18.5. While it ran good i felt no increase in performance over 87 oct. 2012 Ram 1500, 3.56 rears, 20" tires, 2 wheel drive. On several occasions similar trip i have averaged as much as 19.5. With non-ethanol i definately did NOT get any better mileage and maybe not as good.gas bought at Citgo was labeled "a non Citgo product". I knew i would not get enough better mileage to warrant $1.50 a gallon more but did think I'd see a little improvement. Waste of money or me!

 

UPDATE: Latest fuel mileage & Computer Check

A combination of short trip driving and exceptionally cold weather in Western New York State has caused my gas mileage to tumble. The last ten tank fulls were: 13.79, 14.31, 16.01, 14.59, 13.29, 15.90, 16.04, 15.14, 13.25, and 14.39.

Comparatively this is the worst winter for my Ram's gas mileage since I bought it new in May of 2010, and the first winter season (so far) that produced six tanks out of ten under 15 MPG.

There are some that say that their vehicle gas mileage indicators are way off and others say they track pretty well. I've always been interested in knowing mine, so I finally got around to adjusting my Excel spread sheet to include a positive or negative deviation percentage from the indicated gas mileage via the EVIC (computer), to the hand calculated value.

Based on 98603 miles and 287 tank fills, it turns out that the total deviation is +0.42% over the vehicle's life to-date. Out of the 287 fills there were fifty that deviated more than 3 percent. Out of that fifty, 23 were more than 3% positive, and 27 were more than 3% negative.

That includes a few anomalies that could be attributed to just bad fills due to vehicle level at the pump, or fuel flow shutoff pressure of the pump itself. (I typically stop filling when the pump nozzle senses the back pressure and stops.) The only two double-digit anomalies (11.35 & 11.16) were at different pumps and low gallon fills. One was at 5.56 gallons, the other was 4.62 gallons. I'm not sure exactly why this occurred.

I did fill up this morning and immediately drove over to China Freight...er, I mean Harbor Freight, for a total of 44 miles. The EVIC was telling me my average was 19.1 MPG. It was 2 degrees above zero when I left, and 6 degrees when I got home. There are few things still legal in New York State and one of them is sunshine. It's sunny today, but the winds are between 20-25 MPH.

Best regards,
Dusty
2010 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 545RFE, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 98,000 miles.

 

This thread makes me frustrated. Gone to the dealer and received no help. 2012 1500 quad cab, 4x4, 5.7L.

My last fill was city driving and I got a whopping 5.4mpg. It cost me $29 to go 30 miles. The highway drive before that got 12.9 driving at about a steady 70. Best I've ever seen was with a huge tail wind at 20 mpg. Only thing changed on the truck is the addition of a tonneau cover. I hardly ever see the eco light come on, only when I'm costing because of a slower cat in front of me.

 

you can't judge fuel mileage on a 30 mile trip. My 2012 two wheel drive is rated AVERAGE highway 20 MPG, city 14. I suspect yours, 4x4 is somewhat lower. You don't say what your gears are, mine are the 3.55. Also these AVERAGE figures were most likely determined on a Dyno with highway being at 45 mph!!
I usually get from 18+ to 19.5 highway, on a trip driving 75-80!! City, and I mean serviceing customers locally I have never averaged under 16. I am very happy. Now if I drive 60-65 highway, like some on this MPG thread i get 20-22. But I refuse to drive 60-65, rather hitch hike!! Owned several ford 5.4 F-150. NEVER got over 16 on a trip regardless of speed and city? Forget it, highest ever average 12-13. Plus this Ram has LOTS more power and torque.
Look on the Ford forum, the new 5.0 v-8 if they get 16 -17 highway they're doing good. Echo? Those that tell the truth are getting no better than I am and the 5.7 is an engine, the echo boost is a little 6 banger with 2 turbos, not for me!!
I think you're doing lots better than you think.

 

For those that use their remote start in the wintertime you need to consider that your truck is using up some of the gasoline while sitting there idling. Plus the affects of the winter fuel verses summer fuel. Vehicle generally run better in cooler weather but the fuels used in the colder months probably will offset the benefits of cooler weather.

 

All well and good but when it costs a dollar a mile it's a little much. My brother has a truck optioned similar but his is the full crew cab, he has followed me and was getting 5-6 mpg better than me over 200 miles. I don't remember the ratio our trucks have but they were the same. I know someone that has a 2010 that jacked it up and put 35" tires on and gets 19 average on the highway. We use a similar app on our phones, my average is 13. 90% of my driving is highway

 

Idle warm-ups can most certainly hurt gas mileage. I have lost 0.5 MPG just going through the car wash on occasion.

The difference between summer and winter blends is only the volatility rating. Most refiners increase volatility in winter blends to ensure good cold weather starts. It's really the colder, more dense air that impacts fuel consumption. On modern systems as the air becomes for dense, there is a corresponding increase in fuel of the air-fuel ratio. So the engine is just burning more fuel.

Regards,
Dusty
2010 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 545RFE, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 98,000 miles.