I just recently sold my Audi S4 due to not being able to justify spending more on gas in a month than one of my mortgage payments. Gas prices are crazy. I was paying $7.37 (CAD) per gallon.
Listed the car on a Saturday, sold it the next day at 6 pm, bought a Mazda 3 hatchback at 7. Instantly started to save upwards of $300 a month in gas, the Passau bag actually fits in the back nicely, insurance is cheaper, parts and labour are cheaper. I don't like driving it nearly as much though. Going from 400 horsepower with a lovely stick shift and rear biased AWD system to 155 and FWD is a bummer.