i got the 98 12v with a few things done but still lookin at injectors, hx40 adjustabe boost elbow and a few other things with it turned down im running around 16 city and 20 highway had to turn it down was getting terrable mileage for some reason and lots of smoke when i was drivin by mexicans in there ricers tryin to race fill there car with smoke as u pull away and they learned

im also looking for a newer 6.7 cummins just tryin to see if ill be able to swing bout toys with fuel cost now at 3.89 and sayin 4.40 in the very near future

 

I have a 05 auto, and I have the smarty on SW#3, and I still only get 17.9 to 18.3 depending on how much highway travel I do. I honestly thought it would get better, but doesnt look like it.

 

Goldie is awsome She's getting about 22 mpg(GPS app on my EVO) since it's cold. I'm pretty much highway.

 

I made 16.1 with my 2010 dually running 80-85 on a 1400 mile run. I had 1 snowmobile hanging out the box.

So much depends on speed and wind. If I drive 60 with no wind I am in the 20 mpg range If I drive 80 in a 20 mph head wind I am in the13.5-14 range Thats what I have been getting this winter. I got my truck last fall and when I didn't have any miles on it I was in the 12-14 range.

 

I made a 350 mile run last year, and was just shy of 25MPG, all hiway. That was before the compounds, smarty, and new trans.

 

I was averaging 17.5 combined driving around my house, since smarty on #3 I have been averaging 21 +/- a few tenths. thats all 65mph or less to keep the rpm below 2k and coasting down off ramps. also all via lie-o-meter. But I figure an improvement on the lie-o-meter is an improvement in actual milage.

 

23-24 highway @ 1800 RPM ( about 65 MPH).

 

for the lie-o-meter so much depends on accelerating, and idle time at lights or just to run inside the house. I can reset on the highwat and get 22-24 till I get off and have to accelerate up the on ramp or something and that kills the average.

 

I get around 25 on the highway when running 65 mph

 

i get 24.7 in my 12valve about 17 in the 04 & before i totaled it about 13 in the 6.7