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Gas Money Split is a free utility for calculating how much a trip will cost, how much gas will be used, and how much each person should contribute. Kinda like a tip calculator.
It works by asking how many miles you will be traveling, the cost of gas at the pump, what your cars gas milage is, and how many people you are splitting the cost with.
Hit the Calculate button and you are presented with the total amount of gas that will be used, what it will cost, and how much each person will need to chip in. You can even include the cost of tolls, which will be added to each persons total.
There are a ton of apps for calculating what your gas milage is, but they do not let you plan out what your trip will cost. Gas Money Split fills this gap.
Note that this app assumes you already know your vehicles gas milage.