to turn on the high idle you must run a wire to the ecm /www.kennedydiesel.com:.webloc if you go to this link it will give you the instructions to do it. I did it on my truck and it works great !!! if you have a car starter with an available output you can connect it through that and run you high idle from that.
A 2002 Chevy duramax has 300 horsepower stock
The Allison
10 quarts
dealership, ebay.com, or local salvage yard
0.060
300hp
9 and a half
I have read only Ca models do.
I get around 11 mpg's right now on my 2002 but it all depends on how well it's been taken care of, how many miles are on it, driving conditions, quality of the diesel (winter-blend, old, new), etc.
Under drivers side of dash, by your left leg setting in the seat.
Any all weather or all terrain depends on where you like to go.
Pump is about 150 and I just charged 200 in labor on a customers 03 duramax pickup.