15.5. Yep, that was on the highway 90% of the time. 65-70mph, a few passes, mostly easy driving.

Truck is a TRX-4, (Hemi, 3.92's and 17's)
3500 miles.

Lets hope some more miles brings some more gas mileage.

 

Yeah, mine has been about the same. I have a spreadsheet that I track every single tank of gas I put in it. After 3900 miles and 10 tanks of gas I'm averaging 14.9 mpg with my best tank being 15.8 mpg and worst being 13.7 mpg. I drive mostly highway and speeds ranging from 70-80mph.

I have a Crew Cab 4x4 with 3.55 gears and 20" wheels. Only modifications which could affect gas mileage are an Amsoil drop in air filter and Valvoline synthetic oil.

 

I took my average MPG from Texas to Virginia and ended with 20.6 MPG for about 1300 miles. I punched it from time to time and drove smart most of the time.

 

Highest i've had on the highway is 19.7 at 70 mph...have 3.55 rear

 

So far I've done 18.2 mpg at 90% highway at 60-65. Only had about 1000 miles on it at that time. Haven't done a full tank since then on the highway except when I pulled the trailer, and then I got 9.5 or so. I never did better than 20 in my Sport Trac with a 4 liter V6, so I am happy.

 

We are about 70 or so miles from the dealership - all highway. On the way home we were averaging between 15.4 and 15.8. That was going about 70-80. Hard to keep that thing down to 65 ya know. The truck had 23 miles on it when we picked it up. 10 of those were from us test driving it Saturday. Our truck has the 3.55 rear with the hemi. I did keep it around 50 for the first 30 miles home. The truckers weren't very happy....oh well.

 

I drive a truck so I fill it up and drive it till its empty. Then I fill it up again...

I use to drive myself crazy with gas mileage. Now I spend all that energy looking for gas that's a penny cheaper!

I seen 19mpg on the highway at its highest point. 17 is more of a constant. 5.7 with 3.92

14.5mpg average which is 2mpg better than my 07 5.7

 

i drive a combo of city highway and get an average of about 14.5 and i have the 3.55 rear

the best i ever got was this

 

The 2 highway trips I have taken with my CC Sport I was 20 & 21 MPG. I average 14 to 16 around town.

5500 miles 3.55 gears. Calc by hand

 

I get 11.5 all town and 15.5 all highway.

Maybe I didn't need the 3.92's after all!