So I purchased a homemade ultralight airplane that is made mostly from Styrofoam and has a Rotax snowmobile engine with gear reduction and an adjustable pitch composite propeller. The wings come off in just a few minutes so you can store it at home. It uses 1 to 2 gallons per hour depending on the throttle setting. The Skypup ultralight is extremely easy to fly. You do not need a medical or pilots license to fly it.
Our general aviation airplane is super simple to fly also. It is a Piper Cherokee but even thought it is one of the most economical airplanes... it is still much more expensive to own and operate. It does have the advantage of being able to carry 50 gallons of gas and using only about 5 gallons per hour at the best economy speed which is around 100mph.