Gas Saving Calculator Gas Saving Calculator 3 Steps to calculate your monthly savings Step 1 Enter your daily communting data Current Gas Price: per Gallon Travel Days: per Month Daily Travel: miles Monthly Travel: miles Step 2 Enter the vehicle MPG you have now Vehicle MPG: Monthly Gas Usage: Calculated Gas Bill: Step 3 Enter the motorcycle MPG you want to buy Motorcycle MPG: Gallons: per Month: SAVINGS: $12.17 per Month $146.04 per Year