Here's a tip on how to save money on gasoline:
More math: Make gas mileage a criterion as you select your next vehicle. The difference between choosing a vehicle that gets 20 mpg and 30 mpg is huge. Assuming $4-per-gallon gas, you would save $1,000 a year per car. during the typical five years of ownership, that's $10,000 saved for a two-car family.