I haul my 17 around with an Impreza (ok it's got 208BHP) but it's lighter!
You will hardly notive the drop in MPG; I find mine is similar as driveing without towing as I go slower with the boat on the back
I've just towed my new Spitfire 350 miles home with a 2.0 litre Legacy - no problem. I've also towed a Dart Hawk F18 on a heavy tilt trailer - also no problem.