Umm I have two OS 160 engines and they are easy on the fuel. Now my Moki 180 and 210 thats a different story as they love to drink. Myself I like the big glow engines, light and powerful leads to better flying. I like to fly so I spend the cash on glow fuel, no biggie to me. I do like gas also, in a bigger planes( 80" and up), but hey everyone has an opinion.