X15 questions

[AKDoug]

I guess I'll follow this one closely and contribute if I can. I have a new T880 with a 500hp productivity X15 in it. I'm leaving it stock for now. Put the first thousand miles on it this week. Most days are 200 miles of highway with 40 miles of city driving, 5 to 7 stops at warehouses, towing a 48' dry van, average 70K gross.

1000 miles is no measure of fuel mileage, but we're at 5.1mpg hand calc'd. That's a bit better than my '06 International 9400 with 565hp CM870 and '01 379 Pete with 600hp CM570. All with 18 speed manuals.