06 ram 5.7 hemi quad cab trx4, cat back exhaust, k&n intake, motoblue throttle body spacer, superchips tuner (tuned to premium fuel,,performance), bed cover, 25k miles, I also use Amsoil synthetic oil... got 20.5 today travelling from San Antonio to Sherman, excited because I put the throttle body spacer on last night, and drove between 75 and 85. Stock, I was averaging 15 to 16,bed cover gave me 16 to 17,exhaust and intake gave me 18 to 19, but that was only 75 mph or less. My travels are 80% highway and 20% city. Wind direction has the greatest affect on gasmileage. I once got 23 mpg from Austin to San Antonio with a front blowing me south (65 to 75 mph travel speed), and with only the bed cover and intake. My only problem is that with all of these additions, I still have a hard time breaking the tires loose from a standing start. The new hemi has nothing on the old hemi, or the 383 or 440.That said, I love my truck!

 

I don't think about it.

 

12.9 MPG CITY for the last two years 7 MILES ONE WAY
17.9 MPG AVERAGE @55 MPH ON THE FREEWAY on 87 oct
2003 1500 5.7L hemi (3.92) SHORT BED 4x4 with 41xxxSynthetic oil
FIBERGLASS TOPPER
4" SPCAI system with 7" K&N filter
38psi in 20" tires/wheels
Launch easy, hold 2000 rpm till overdriver kicks in at 42mph.Jocky the the overdrive button to keep the RPMs as low as possible, but alway
blow awayany Soccer Mom (on her cell phone) or Rice Grinder (with a 767 wing on the trunk), that tries to out accelerate you to the free way entrance ramp or when they are in a lane thatends in 500 feet. Hey, It's a HEMI!

 

Just back from 1800 mile trip CO, NM, AZ mostly 2 lane with ~ 400 mi interstate, 60 mi 4wd in snow, lots of hills, headwind,: 15.9 for whole trip (from gas reciepts). '06 QC w/ hemi, 3.92 axle, TRX pkge, short bed, 12k miles. Great truck. Power seat and hemi= great road combo.

Mtnbound

 

07, 1500 QC, Hemi, 20", Thunder road....400miles on truck as of today...7 city...10 highway....uh...is this going to get better the more miles I put on the engine? Looking for low to mid teens. (Coming from an 05 Town and Country to my Hemi...I feel like I'm dating Carmen Electra What a great truck.

 

Same truck in Black (like it makes a difference...). Very happy with 15-16 mpg on the highway... almost 1000 miles and smile all the way... Hemi rocks[8D].

 

07 quad cab 4wdr turbo exhaust k&n 12mpg in drive with mds, 15mpg in tow haul mds off.

 

2004 1500 RAM 5.7 HEMI 15.9 mpg

 

After recent 1900 mile trip from VA to Iowa and back to VA, 17.1 in a 2007 QC 4x4 3.92 Hemi on 20's.
Average speed was 75, ran cruise 90% of the trip.
Truck has 3500 miles on it now.

Its not even broken in yet !!!

 

I've got the 4x2 model. Around 3500 miles so far. On strictly highway trips with my tailgate down I've got 21mpg at or around 75-80mph. With the tailgate up I've got around 16 or so. My normal commute which is probably 60/40 city/hwy miles, I average around 12.3mpg with the tailgate up. Tailgate down, more like 13.4mpg.