TLDR: I spent around $2,291 on gas for my car alone last year (Not counting my wifes).
I drive around 20k-30k a year sometimes a little more. I currently get around 30mpg in my Subaru with gas hanging out around $2.75ish average in my area. This last year I drove around 25k miles.
25,000 divided by 30mpg is 833.3 gallons of gas in the past year. 833.3 x 2.75= $2,291 in the past year.