M923A1 hiway fuel mileage

[Dixmotorpool]

Can anybody tell me what kind of interstate hiway fuel mileage I can expect to get out of an M923A1 with the 14.00 R20 XZL tires? 250 cummins naturally aspirated, allison automatic trans.

 

[EMD567]

^
6-7 MPG if you are lucky.

 

[wsucougarx]

I got 8 MPG in my M923 with 395 super singles on her. I had an average cruising speed of 55 MPH. I thought this may have been a miscalculation but I also averaged about he same when I initially brought the truck home (410 miles).

 

[porkysplace]

Florida to Missouri, M923 pickup

 

[Dixmotorpool]

my tires (14.00 r20) are 48 inches in diameter, how big are the 395's?

 

[M35A2-AZ]

I get about 7mpg with my M923A1 with 14x20's.

 

[Beerslayer]

I get around 7 MPG with my M923a0 running 1600.20s

I got 9.5 MPG in my M923a2 running 1400.20s. I was amazed at that. Had to doublecheck the math. It gets better mileage than my deuce at twice the weight.

 

[seano11]

If I did my math right I get 9mpg running at 1800rpm in my 813 with 1400s

 

[rrrr]

My 932a1, unloaded, with 14's get 6.5 mpg at 50 mph and 6 mpg at 57 mph. This was over a 600 mile test on recoverying another MV.

 

[Lonekazoo]

My experience is between 7.5 and 8 in an M923a1 (Michelin 14x20 XL's) on my recovery trip (1000 miles), but I was in a convoy with three A0's, so cruising speed was kept down to around 1700-1800 rpm. I was also adding DieselKleen--Not suggesting it increases mileage, but it does seem to smooth things out a bit.