best duration = lipolys, but if your going to gas.. why bother? I had the tigrt moth flying 1 and 1/2 hours on li-polys.. but it's all about what you forsee in the future. I was gas all the way ,but am now 1/2 and 1/2... I like large gas and small electrics and stay away from those 40 size ships now.. I guess I like the extremes?
lol
just me though.. there's not anything you can use in a tiger moth that will work in a 40 size ship.