m5040 1 Posted January 22, 2008 Share Posted January 22, 2008 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 ? Quote Link to post Share on other sites
b61mack 165 Posted January 22, 2008 Share Posted January 22, 2008 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 Quote Link to post Share on other sites
Lmackattack 1,074 Posted January 22, 2008 Share Posted January 22, 2008 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 Quote Link to post Share on other sites
MACKS 257 Posted January 22, 2008 Share Posted January 22, 2008 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. Quote Link to post Share on other sites
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