hello all! i was wondering what the benefits to gas is over glow? i go through so much glow fuel im goin broke! gas is obviously cheaper. whats involved in switchin over on 40 and 60 sized planes? what size gas engines are equal in power to say a saito80 or a saito91? i was lookin at this gas engine-BT-24A 23.9cc/1.5CI Gas Engine. what size plane would this fly and is it a good engine?

any help as always greatly appreciated! thanks in advance!
-kevin