Originally Posted by lapeer20m
Well, i have yet to purchase the bus, but have made the decision to do so.
I do not know much about newer computer controlled engines, but my guess is that they are more efficient than their mechanically injected counterparts.
First off I'm a Cummins guy. The only other thing I will drive is the international 466, and that's only if someone other than me is maintaining it.
Sorry to bearer the bad news, but the newer computer controlled engines will make less fuel mileage than the old ones. As they get more power out of them, that power has to come from somewhere. Also the more power you use, the more fuel you burn.
Look at the history of the Cummins engines in the dodge trucks starting in 89 to now. My old 91 made 25 to 30 mpg. Then they added a computer in 94, and upped the power, fuel mileage dropped 20% to 30%. Now I drive a 2003 Dodge Cummins and with out the economy chip, it was getting only 10mpg stock empty, and 4mpg loaded at 25,000 gross truck and trailer. Add the chip and it's back at 14mpg empty, and 8 to 10mpg loaded.
Where you will get the advantage with the newer stuff is the locking torque converter in the newer Allison Auto's. Should save you a bit over the non locking. I have no experience with the big auto's yet as I only have standard transmissions.
I liked your first build, I'll be watching this one.