Join Date: Mar 2007
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6.4 Bad Fuel Milage
Don't know why everyone is crying about the fuel milage. Oh and its not going to increase 10mpg after breakin. Here is why:
First, go educate yourself about BSFC (break specific fuel consumption) on a diesel.
2nd- displacement. The more volume in the cylinders, the more fuel/air it requires for the same rpm.
3rd-Every body thinks the twin turbo is cool.......spools quicker right! that equals more air which requires more fuel- sooner.
4th- HP, takes fuel to make power, more power=more fuel (see number 1) Thats why everybody has to put bigger fuel pumps on when they start doing the high hp mods.
ReGen- wastes fuel
4.30/4.88 gears-aren't conducive to any thing but pulling. Unless some makes a trans with a quadrupple overdrive, milage WILL suck.
Moral of the story-if you can't afford the fuel bill, don't buy the truck. On average the 6.4 WILL NOT get better milage than a 6.0 in the same truck with the same final drive ratio. A 6.7 Cummins won't be better than a 5.9. The 05/06 cummins (325/610) IS less than an 03/04 (305/555) See number 4