How much gas money needed to drive 2000 miles?

I have a 03 Honda Civic, MPG says 38 highway but new studies say those numbers are not factual.

30 miles per gallon x $3 a gallon x 2000 miles =

PS I only have $350 dollars I don't want to run out halfway there.

Please factor in the Rockie Mountains, and that cheap truck stop gas that you seem to burn through faster than the good stuff

I may not even stay in a hotel just cause I am too afraid to running out of money

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