Posted by the tractor vet on November 17, 2021 at 10:03:46 from (108.220.145.239):
In Reply to: Miles per gallon posted by SVcummins on November 16, 2021 at 20:54:09:
Way back in the early 60's when i first sat in the big seat of the B model Mack she was gas powered and pulled the fifty ton Rodgers low boy , the company only had a couple diesel powered big trucks . The Mack carried around 185 gallon of gas . When we first started to make the move to the start on the Interstate job she was gas and it was around 290 miles from the main shop and yard to the marshaling yard we were setting up the year before we started work The first time i hauled the dozer i was to run the Mack hauled it in one chunk . 14 foot wide blade cab and three shank ripper just under the fifty ton rating of the trailer . No interstate to run on back then just the old state and U S highways thru all the small towns up and down hills around sharp curves . Took between 12 -13 hours . Leave the shop with full tanks and get to the job site with under a 1/4 tank . Unload go to the Motel get a nights sleep next morning check the truck over and fill it and head home and in 7-8 hours be home with just under a half tank. For her day she was a monster Big six cylinder with a Big holley 4 bbl . That winter she was switched out to a Mack Diesel with a added turbo . That took two hours off the drive down due to the added pulling power on the hills . Now you were FLYING up the hills a a mind blowing 18-24 MPH instead of the 7 -14 MPH and wow were were now over 4 MPG instead of the 2.5 to 3.5 . The down side was the loss of the top speed due to the limited top RPM from 3850 with the gas now down to 2450 with the diesel . Not that we ever even got the gasser flat out but it did trim her wings to a 64 MPH flat out and that at times was where i would let it hang out empty , kept the dust off the trailer ya see.
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