A Toyota Camry hybrid does not move 110mph at 22mpg with a 700mi range. Once you start moving fast the fact that it's a hybrid is irrelevant since the engine must provide 100% of the power.
I personally don't see the point of comparing a car at 50mph with a small plane at 120mph, but if you really want to, I bet that easily doubles fuel efficiency. No one flies at Vg because that's stupid, but you COULD, and then you're basically the same fuel efficiency as a car but flying in a straight line.
Even that 22mpg is not a 1:1 comparison because of that inconvenient "as the crow flies" thing. We can build more efficient aircraft in theory, but in practice the regulation gets too expensive.
I personally don't see the point of comparing a car at 50mph with a small plane at 120mph, but if you really want to, I bet that easily doubles fuel efficiency. No one flies at Vg because that's stupid, but you COULD, and then you're basically the same fuel efficiency as a car but flying in a straight line.
Even that 22mpg is not a 1:1 comparison because of that inconvenient "as the crow flies" thing. We can build more efficient aircraft in theory, but in practice the regulation gets too expensive.