E7 Aset Fuel Milage

[jdrslyr75]

I'm trying to figure out at what engine RPM the E7 ASET's get the best fuel mileage. I found a good road speed calculator and it seems like the rearend ratios in the used Macks I have been looking at are much lower than most other manufacturers. As a former Cat technician, I know that their engines like to cruise around 1500 RPM for fuel economy. I'm just wondering where the E7 ASET likes to cruise.

Thanks,

Jeremy

[bts-4120]

actually the big cats are set up to cruise at 1350rpm's my e7 runs 70 at 1500 55 at a little above 1200 truck get the same or a little better running 70 than 55 I run 3.70 on short 22.5's with a 13'spd I would not want any taller geared truck than that

[Mackpro]

I'm trying to figure out at what engine RPM the E7 ASET's get the best fuel mileage. I found a good road speed calculator and it seems like the rearend ratios in the used Macks I have been looking at are much lower than most other manufacturers. As a former Cat technician, I know that their engines like to cruise around 1500 RPM for fuel economy. I'm just wondering where the E7 ASET likes to cruise.

Thanks,

Jeremy

I had our computer hooked up to an 2004 CX613 with a ASET 460P, with fullsize 24.5 tires, Mack 13 speed and 3.90 rear gears. It was getting 6.6 driving MPG and 6.2 overall including idle time, not bad.

[Gambi80]

actually the big cats are set up to cruise at 1350rpm's my e7 runs 70 at 1500 55 at a little above 1200 truck get the same or a little better running 70 than 55 I run 3.70 on short 22.5's with a 13'spd I would not want any taller geared truck than that

I've found mine gets the best overall milage around 1350-1400rpm. 22.5 tall, 3:86 and 18sp.

The bulk of my work is hourly, so 55 mph is max (nobody wants an over-achiever)...but that puts me almost between gears...1250rpm or 1500. Best I've been able to pull out of it is 7.65 mpg.