The basic answer to your question is to divide the number of miles along the route from Atlanta to Dallas by the number of miles you get from a tank of gas. Easy!
First, how far is it? Select a route and determine its length. If you've found WikiAnswers, you can find MapQuest.
Second, determine your vehicle's fuel efficiency ('mpg,' or miles per gallon).
Third, find out how much fuel your vehicle will hold.
Multiply your vehicle's 'mpg' rating by its fuel capacity. The result is your vehicle's 'range.'
Then divide the length of your route by your vehicle's 'range' to find how many tanks of gas it will take.
Simple arithmetic!
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