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My basic rule of thumb is will it pay for itself in 2 years time. It isn't a hard and fast rule, but more of a goal.
I'm average about 72 miles a day with a fuel cost of $0.168 per mile.
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Project Moby Dick
Best Tank Avg: 26.6 mpg | 66.3% over EPA
Best Short Trip Avg: 29.5 mpg | 84.4% over EPA
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