Are Rotax engines fuel efficient?
Rotax efficiency shines the rotax 912 uls burns just 4–5 gallons per hour at cruise, compared to 12–18 gph in engines like the io-540. Rotax has more than 10,000 engines on the registry, but only about a third of those were the 912 and 914 four-cylinders we were interested in. Based on our data, the overall rotax failure rate is 1. And here a warning about small numbers; an accident or two can sway the rate substantially.