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The gearing of a M1008 will yield like 8-9 mpg (at best) and won't like highway speeds much better than the 6.2. The 6.2's get 16 - 18 in the M1008's, and can be easily modded for more power faily cheaply.
As far as the starting issues, I would recommend buying a set of AC Delco 60G glowplugs...