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Realistically DI and throttleless engines are as FE as diesels.
If they jumped those two fences at the same time they'd pop some serious FE gains.
If they do that and run it lean all the time like diesels and use the turbo to create the artificially high AFR it will get closer to diesels. Instead they will use it to maintain HP with lower engine weight. Just give it less go, no throttle body, DI and a turbo to jack AFR.
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