Question for Ram 6.4 Hemi owners

I'd hang tight until Ford brings out the V10 ECO boost... twin turbo/intercooled

600hp @ 4500rpm / 847lbs-ft at 1900rpm on 87 octane.

25 mpg highway

M.R.E. wrote:
In '14 they said it used 87 octane, now it says premium unleaded . If that's the case, I would rather buy diesel , gas engine isn't worth premium to me . What is your opinion ?

Let me get this straight. You don't want to pay the extra for premium fuel but you will pay a extra premium for a Cummins and extra price per gallon for diesel?
Not sure about max tow rating for the Hemi but I would think 13k trailer would be almost max GCWR. The Cummins wouldn't break a sweat, but that's quite a premium to pay :W
Everyone's towing expectations are different, I myself would get the diesel.

Towing 13,000 pounds you will be much happier with a diesel 3500 SRW. 2500's just do not have the CC for trailers that size. Later today I am going to weigh my 2015 3500 SRW ready to tow. Given that it weighs right at 8K without me, the boxes, and hitch, I am guessing I will be at 8600-8700 with two of us and set up for the snowbird flight. That is going to leave 3K for pin weight, and if I want a larger trailer I should have gotten a dually! Lightly load with the trailer the rear axle was at 5920 with a RGAWR of 7K. So I have more over head on the rear axle than the GVWR of 11,700.

With a 2500's 10K GVWR pin weight gets you over very quickly.

Chris

I always run 91 octane in my cars, and it seems to improve the MPG enough to offset the extra 5% that I pay for the fuel.

The computer has a anti-knock sensor, and will run the engine rich or change the timing automatically to compensate for low octane fuel that caused pinging you can not hear, but the engine vibration detection system can pick up.

Try higher octane for a couple of tankfuls. First check your mileage with 87 octane, then 91. See what happens.

Fred.

I've always used 87 in mine, and haven't had any issues. I've tried 89 a couple of times, and couldn't tell any difference, although we're at a few thousand feet of elevation.

I have a 2015 ram 6.4 and 89 is recommended but 87 is acceptable per owners manual. I use 87 and it runs and pull fine for me.

I tow with 87 and it seems fine. I've seen discussion of guys using 89 and it's mixed as to whether or not it improves things at all.