The fit is naturally gets great mpg. Whenever I take it on trips it averages 40mpg at 80mph. Due to progressively wearing Bridgeston Potenza performance tires and worn rear shocks though, I've seen a 3-4 mpg drop every fuel up. On the OEM tires, it would be a bad day if I got under 40mpg regardless of where I was.
No permanent mods to date, just cardboard experiments.
LRR tires and new 12lbs wheels. K&N ram air, A Partial Kammback, front fog light covers, and partial intake cover will be in the works when I get a warm day.