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Actually a carb or throttle body can be basically as efficient as true direct injection but most cars didn't control the A/F well using carb tech which was designed for true mechanical ideot proof operation. AKA rich Not many bother with electronically controlled carburation which is basically what throttle body is.
Next the old hit and miss engines from before 1940 into the 1800's ran on vapors, every one. I can't say they were extremely efficient but it works just fine and is simple. The trouble with any kind of vapor system is that the carb will gum up with laquer if it actually vaporizes the fuel.
Something that did intregue me was the catyllitic carburator, something that may have been more efficient than FI. They explored it prior to using a CAT to clean exhaust, instead the cat cleaned the intake charge (sort of)
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