The fuel savings translate into about $600 less in gas costs over the life of a new vehicle, NHTSA projects.
I don't understand this. Let's be extra safe and say I currently drive a car that gets 30 mpg 15k miles per year and the average fuel price was $3.60. If I switched to a vehicle that got 50 mpg, my savings per year alone would be $720.
15,000 mi / 30 mi/g x $3.60/gal = $1,800
15,000 mi / 50 mi/g x $3.60/gal = $1,080
$1,800/yr - $1,080/yr = $720/yr
Still being extra safe, let's assume the car only makes it 100k miles, that's a savings of ~$4,800 for the life of the vehicle.
100,000 mi / 15,000 mi/yr = 6.67 yr
6.67 yr x $720/yr = $4,802.40
$4,800 > $600
Again, this is being safe with a car that is fuel efficient, a person that travels a relatively short amount, and with low fuel prices. What am I misunderstanding??