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I just got back from a trip to Montana with my 83 Crew cab dually with a 454. I got between 6 and 8 mpg pulling a loaded car trailer both ways. That mileage is terrible. I would love to put efi and a 4L80E in that truck but I may end up with a duramax before I do that...
I would stay away from the 454 for anything you have to drive daily. I love my 86 with the 6.2 diesel for that... 23 mpg...
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Joe
'75 GMC Gentleman Jim
'84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter)
'85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans
also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed
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