Sure, but, as (s)he said, (s)he drives 5-10K miles / year. For 10K miles, that's a difference of less than 100 gallons of gas per year, meaning less than $400 /

Sure, but, as (s)he said, (s)he drives 5-10K miles / year. For 10K miles, that's a difference of less than 100 gallons of gas per year, meaning less than $400 / year in gas for the Civic vs the Prius. ~$1 / day probably isn't going to drive behavior change or a willingness to spend more for an otherwise-inferior car.