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I just did a very rough number crunch and I'm fairly sickened by the results... with gas at roughly $3.75/gal and diesel at about $3.95/gal (in these parts anyway), and assuming 10k mi of driving annually, if I paid $1k to swap a diesel into the truck and managed to average 30 mpg with it, the fuel savings would pay for the engine in just over 10 months
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