With inefficiency comes serviceability, but the "inefficiency" of carbed motors is a bit of a myth. There were cars per 1975, carbed, that ran 30 or more MPG. I'll try to remember a few if I can. I never cared to memorise or write down the names, not expected them to be impossible to find with a google search. As time, machining, metallurgy and understanding of tolerances has progressed, I don't think it would be a stretch to think that carbureted motors could reach today's mpg had they stayed in service.