I average 17, i will get 18-18.5 on the interstate at 70mpg.

 

18.9 usually

 

best 75 hw- 25 city, average 60-65-19.2

worst 16.1 (new turbo couldnt help myself

 

well i drive interstate 70 about 300 miles at least twice a month and last time i checked unloaded i was getting 24 MPG at about 75 and 2,000 RPM. Last time a i was loaded, 20' gooseneck(heavy duty) with a jeep grand cherokee zj on the back, roughly probably about 10,000 lbs. i got right at 18-20 MPG holding 70mph no problem and even passing people up hills. I love my 24v cummins. My mom drives an 1999 Toyota 4Runner V6 and the best milage she gets anymore is right at 14 MPG. i just laugh thinking my full size 3/4 ton gets almost twice as good of milage as her smaller SUV.

 

I live in a small town about 65 miles north of Houston. So much of my driving is highway.

My truck is BONE STOCK (and the exhaust sounds strained at idle).

I drive more for mileage than "to get there" accelerating as gently as I can get away with and coasting whenever possible.

I have the Autotragic transmission and 3.73 rearend. And I treat the tranny as gently as I can particularly when it shifts into OD (I lift).

My average over about 120 fillups written down religously stands at 18.878

I once got the overhead readout up to 25.7 on a trip from Shepherd to Corsicanna, TX via US287. And I understand that the overhead isn't NEARLY always right, but that reading was achieved from a fairly long 21.x reading at the start!

I regularly tow a 5,400lb full 2,000lb empty dual axle tank trailer 270 miles one way to Corpus Christi, TX and make it easily ther and back on one tank of fuel.

I would imagine gutting the cat would be quite helpfull. And I COULD run my tires at 80 psi instead of 65 front and 70 rear.

But I figure asking a gasser motor to do what I do would get me no better than 14 and probably a lot worse....

 

94 reg cab auto 3.55 95,000 miles 19/24 best tank 27mpg
06 mega cab auto 4.10 3500 miles so far seems to be around 13ish

 

17.0-17.5 MPG each and every tank. Doesn't seem to matter much how I drive it, the mileage always comes in somewhere between those two numbers.

I do a lot of highway driving, I'm currently running 235/65 tires, thinking about stepping up to 265/75s. I have the 3.55 gearing and don't want to hurt my mileage by going to too tall of a tire.

What's the tallest tire I could possibly run and not degrade mileage?

 

Best I've gotten is 23.7 at 1800 RPM. All highway between La Mesa & El Paso. Tires aired to 80 PSI.

 

My truck has about 17,800 miles on it.

This past Friday I made a trip to Bremerton, Wa and back (Milwaukie, Or). Round trip was 389 miles (90% freeway). Unloaded. Edge set on "1".

Hand computed mileage was 21.3 mpg. My overhead readout said 21.7.

To and from work (11 miles each way) is high 14's to about 15.2 best.

I'm hoping with more miles on the CTD, I may see slightly more. Although I'm not disappointed right now.

 

I've running based off of overhead so far because i'm to lazy to figure it out by hand but with stock tires and 4.10s and a 6 speed running 70mph on highway at 2250rpm i'm getting 14mpg.

 

around 16 95% city miles with tons of hot rodding and shifting. Should get a good highway report this weekend, going on a road trip.

 

410 gears 35inch tires 16mpg uncorected

 

17.57 today when I filled up with a little less than half a tank.

Anyone else see better mileage filling up around half a tank?

 

18 down south ...........highway ...........citty i try not to look

 

i went from ohio to the hills of pa. with my 91, i had my car trailer in tow loaded there and back and i had my foot to the floor a good part of the trip, and i got 17.7 hand calculated. i don't ever get it on the highway, and it doesn't matter now anyways as it gets driven year round with a 1200 lb. "press die" bolted in the middle of the bed. weight for winter so i don't have to plow in 4 wheel drive and i'm to lazy to take it out in the spring, so the mileage isn't that good now. the mileage really sucks when the plow salt spreader a skid of salt and my extra weight in it. i weighed it for the hell of it last winter when it was fully equipped, it weighed in at 10,500 with me in it. that's what i call a tank!!! i can floor it in 6 inches of snow in 2 wheel and not even come close to spinning a tire.ha-ha later, pete