Question about 6.4 Hemi

10,500# fiver with the 3.73 axles - it does fine but a diesel really would be better. Mine is my daily driver 98% of the time and towing 2% so I'm fine with it. My MPG are pretty identical to what Drittal posted. Stop and go city driving kills the MPGs. As does flying down the highway over 65.

At 10,500# I feel as though I'm pretty close to maxed out. The 4.10 gears would help. Doing a gear swap to the 4.56 would really make this thing a towing beast. But again, I'm fine with my setup. The 12K you are proposing? That's getting up there but still within the theoretical capabilities of the truck.

It really is all relative. 20 years ago you'd be laughed at for suggesting a 2500 series truck could even dream of towing a 12K trailer while getting anywhere near the MPGs the 6.4 Hemi gets. Overall, this truck is outstanding.

It'll take a bit of work, but if you search this forum for "ib516", you'll find a fair number of posts by him. He's towed in that weight range with the 6.4L.

He also put up a video on youtube.

https://www.youtube.com/watch?v=Ji9I_hmZ88Y

I don't know if he hangs around here anymore (life gets in the way sometimes), but he is/was a great resource for towing with the 6.4L.

I like my 6.4L a lot, but I don't tow up in the weight range you're looking at, so I can't help you much.

I wish I had definite answers for you.

MPG depends a lot on driver habits. Mine is out family truckster. If I get in after my wife the Avg. Begins to rise. As soon as she gets in the driver seat it drops fast.

Here are my indicated MPG.
Towing 11,000 TT @ 62 = 7-8
Empty at 65, 19.5
Empty at 72, 17.5
Empty at 80, 13.5
My wife gets about 12.5 city.

Tows fine, hold out for 4.10 rear axle ratio. It has tall 1st and 2nd gears.

If you expect it to tow 12,000lbs like your cummins, you will be greatly disappointed. No grunting along at 2,000 rpm. You will see 3k, 4k, and even 5k at times. It will downshift, a lot.

Is a gas powered truck right for you? Only you can answer that.

I was looking for info on the 6.4 Hemi but I forgot to include that in the first message.