Most of it has been said here except about economy. The C172 has been available with fuel injection since 1999 and I believe the Majority of PA28s, even recent ones still have carbs.
The advantage of F.I. is no carb heat required and substantially better economy.
My Archer used 40ltrs ph. A C172 SP I use burns closer to 30ltrs ph for similar airspeeds.
In fairness the Cessna is 20 years newer.
DO.
Last edited by dont overfil; 17th Sep 2010 at 08:22.