You're prolly smarter than me, I don't file mine- my carrier does. Hopefully an independent can give you a more black and white answer.
But, if you have the road atlas, you can calculate it (almost) to a T if ya know how many miles you ran in what state, and how many gallons you bought per state, per quarter. I'm sure the tax info can be found online somehwere.
HTH
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Mud, sweat, and gears
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