Jeez, all this friction over saving some gas. Just use cents per mile. Then the cost of driving the FSP is staring you in the face. Better yet make it a deductible business expense at 50 cents a mile, and ride a bike that easily gets 80 MPG without even trying.
4.5 cents a mile in fuel cost means you have 45.5 cents left to cover all the other costs.
Now at 10 MPG you are at 35 cents a mile and at 12 you are at 29 cents a mile.
Comapred to 4.5 you still have a long way to go.
regards
Mech
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