At an average of 12,000 miles per year....
15mpg = 800 gallons of fuel.
$2.29/gallon = $1832 per year
$2.79/gallon = $2232 per year
$3.29/gallon = $2632 per year
$3.79/gallon = $3032 per year
$4.29/gallon = $3432 per year
20mpg = 600 gallons of fuel
$2.29/gallon = $1374 per year
$2.79/gallon = $1674 per year
$3.29/gallon = $1974 per year
$3.79/gallon = $2274 per year
$4.29/gallon = $2574 per year
25mpg = 480 gallons of fuel
$2.29/gallon = $1099 per year
$2.79/gallon = $1339 per year
$3.29/gallon = $1579 per year
$3.79/gallon = $1819 per year
$4.29/gallon = $2059 per year