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Carbs vapourise petrol before it goes into cylinder.
That's basis of EFI and direct-injection, completely vapourising petrol. Once it's in cylinders, you'll still need stoich mixture of 14.7:1. Honda's done good job of using leaner 16:1 or so by concentrating richer mixture near plugs. Not sure how you can lean it out more than that and still have useable combustion. About 16.5:1 was leanest I can get for steady state low-load cruising. As soon as I add throttle for acceleration, it would start knocking & pinging like mad!
F1 turbo cars in '80s heated petrol to 70-80C before injecting. On one high-boost car, I actually aimed injectors upstream back at throttle-body for maximum turbulence and vapourisation. It was large 150-lb/hr injectors due to large volume of E85 needed. Ended up with better performance using dual staged injectors, 2 per cylinder. Again, straying too far from stoich mixture lowered power and efficiency.
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