People make a big deal about how much they spend on fuel but does MPG really matter much? Well, it depends on how much you use throughout the year but it would need to be a lot. I base this on the $0.54/mile tax deduction we get at the end of the year. If you put 10,000 miles on your car you can deduct $5400 from your earnings. You are basically getting your fuel for free. 10K miles a year is 200 miles a week (we will use 50 weeks to account for holidays/vacations). Even if your car got 4 MPG and you used 50 gallons a week at $2.25/gal you will only have spent $225 more on gas than the mileage deduction reduced your tax liability by. You are basically paying down your tax bill one tank at a time. So now, instead of being depressed watching your gas gage head for empty you can just see it as your taxes going down each time.