Expanding this topic ... I've pretty much quit using GasBuddy. I'm not a premium member as I don't buy enough fuel to make a savings on top of the $9.99/$7.99 monthly fee. I rarely get over 5 cents to 7 cents a gallon on the free membership plan ... more often than not, 3 cents a gallon. With diesel prices as they currently stand ... that saves me ... (drumroll) about $1 for every $100 spent in diesel.
