How Many Mpg For Maxidyne's, Any Prob W/low Sulfur

[m5040 1]

I am looking to purchase a single axle and have heard about the effiecency of the older Macks, I have heard most trucks are lucky to get 5 or 6 mpg. What is the consensus and what GVWR/road speeds? Has anyone noticed a change with the ultra low sulfur fuel ?

[b61mack 165]

I am looking to purchase a single axle and have heard about the effiecency of the older Macks, I have heard most trucks are lucky to get 5 or 6 mpg. What is the consensus and what GVWR/road speeds? Has anyone noticed a change with the ultra low sulfur fuel ?

I have a B61 tandem axle tractor with a 300+ 13 speed with overdrive 3.87 rears i cruised around 1600 RPM bobtailing and i got 10.3 MPG, didnt think that was bad, havent heard about older engines without turbos or maxidyne engines. Ron

[Lmackattack 1048]

my 285 Mack gets 5.5 loaded 6 empty.

Drove out to NY and Back a few years back loaded one way (R model) and we got 6.5 avgMPG ...350 w/9speed 5.02 rears thats pretty good for me

[MACKS 237]

1983 e-6 315 with a 12 speed overdrive rears are 519 or close to it, this on a 10/w dump with a lot of stop and go, 4.6 mpg. I had a 70 237 10/w dump with 450 rears and a six speed that got a least 7 mpg in stop and go.