Hey ive had a cat c12 for 10 years and its been phonominal in fuel mileage. and as far as the big block motors go unless youre lookin for a 600 horse motor the extra 1000 lbs the bigger motor,trans ,and driveline weigh arent really doin any good. 580,000 miles on my c12 only thing ive done to it is a turbo.I pull 80,000 lb loads as an owner operator and the company trucks w/ the big cat c15 motors cant pass me up. my fuel mileage pulling a flatbed in Illinois has been avg 8.5.when i convert this to a motorhome (when i retire) i expect to get 10 1/2 to 12 mpg.9 or 10 spd trans would be ur most fuel efficient manual trans to run.
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