My 1995 car (premium at the time) diesels horribly on the cheap stuff so I don't use it; the cost of repair is probably going to overwhelm any savings, given my

My 1995 car (premium at the time) diesels horribly on the cheap stuff so I don't use it; the cost of repair is probably going to overwhelm any savings, given my driving habits. Which I suppose is exactly his point; do the actual math. Don't step over dollars picking up pennies.