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You have to use half a tank of fuel for return trip to the gas (literally) station?

 

I got my Casio calculator out to work out that it takes 140 miles journey round trip to fill a 310 mile capacity.
You are left with 240 miles when you get home but need to reserve 70 miles for the next run to the gas station. Thus your usable range is 170 miles.

Conclusion: You need to drive 140 miles to get 170 miles of usable range.

Regards,
MTF

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