c 13 mpg

Higher horsepower and 65 mph equals better fuel mileage. .. NOT

 

Change you mufflers,i have a columbia 07 with c 13,and
Mr.haney ecmtuning ,now driving from ca-Il,lightload 15k, last 4981 miles, 704.018 gallons fuel,speed @68,never drive with cruise,iam. Very very happy with my c 13,500 HP

 

Actuallly!, Yes you can get better fuel milage with high porsepower, but other thing have to go with that, like trans gearing and gears in your drives, Motor doesnt work as hard to hold the speed

 

1500 rpm is likely your problem, If you could cruise at 1200 your fuel mileage would be way up.

EDIT = I did some checking and I was wrong. Got this from an article on fuel economy. "Cat's other heavy-duty models should turn at these rpm at 65 mph: C13 Multi-Torque with 1,750 pounds-feet, 1,325 rpm; C13 with 1,650 pounds-feet, 1,400 rpm"

 

i have doble exhaust i have pittsburgpowermuffler,driving 1400 rpm=speed 68 -40 Psi oilpressure

 

my C 13 is 500 HP@2100RPM,1750 Peak Torque@1200 RPM

 

my gear ratio is 3.36 WITH 10 Speed

 

what truckmodel you are driving