475 ISX or 475 Twin Turbo Cat

sorry, it's an '05 volvo 780 with a 13 spd and 3.42 rears on 22.5 lp tires. and that's not by the computer, that's by pen and paper

 

Running just 2% biodiesel raises the lubricity and does not void the warranty. This blend only raises your gel temp only a couple of points.

 

People think big power means poor fuel milage. Not true. Use that power only when you need it and use it wisely and you will get better fuel milage. I gross 107,000 lbs hauling bulk in NY. My last truck had a 500 detroit and only got 3.9 mpg. My current truck has a 530 cummins (200 more FT LBS of torque also) and gets 4.4 MPG. A guy I run with has a Cat C16 600 and get 5.1. He is burning more fuel when hes pulling hard but he pulls hard for less time. Over the hills faster, up to speed faster, cruseing speed faster.

 

Im on the same page as you Mel. To me more power = better milage and its more economical in most cases. You make more money to if your truck can actually keep the speed limit.

 

most of the (slop hood) trucks you see like the prostar and (pete 386) have the 3:55 gear ratio so you would thing that wound be the best fuel millage going about 65 or so, but the big hoods seem to need 3:36 ratio for there's, weird ant it, there should be a sheet saying slop hood use this gear ratio for cross country, big square hoods use this gear ratio, but the same engine and trainy,and box trailer

 

it is, but I beleive it... I have a 475 isx on a 379 pete witha 10 speeda 373 gears and i am getting 6.4 to 6.7 grossed out. and as heavy as 90k... ps thats average, loaded up and dead heading back.

 

If you are concerned with fuel economy, go detroit.
If you want power and grunt, go Cat.
If you want a nice mix of the two, Go Cummins.

Nicely Said!

 

Correction, If your confused and dont expect the former two, go Cummins.. LOL

 

Here's my real world experience. I had an 05 Peterbilt 387 with a 475 ISX 10 speed and 3:36 rears. I run from Salt Lake City to Cleveland and back grossing 75-78000 lbs. I drove 68-73mph and averaged 5.8-6.1 mpg. I now have an 06 Peterbilt 387 with a 475 acert twin turbo Cat, 13 speed 3:55 rears. Run the same way I'm now averaging 5.1-5.4 mpg. I now pull hills 3mph slower than I did with that Cummins. Kind of wished I had that old truck back.

 

Your acert is geared too low is why the fuel mileage is worse. The Cummins would have done better with the 3:55's the acert would be best with 3:36's.