They weigh more but have lower fuel consumption. More complex than gasoline aero engines. Usually more reliable but making them light probably impacts that. I t

They weigh more but have lower fuel consumption. More complex than gasoline aero engines. Usually more reliable but making them light probably impacts that. I think the lower fuel consumption compensates for the higher weight for longer flights. Big reason for switching to them after 100 years of using gasoline is aviation gas is expensive and concerns about lead. Big picture I think refineries and distributors don't want to supply aviation gasoline anymore.