Gas mileage and boost poll

mbaird said

My Mazda is multiport injected .

I am trying to think this thruogh….wouldnt the increased efficiency translate into less throttle input required for the same excelleration translating into better mpg ?
There has to e a reason all the modern cars have smaller turbo/supercharged engines . Granted they have direct injection , optimal chambers , bett management systems etc….

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The reason is specific output and fuel economy. A smaller turbocharged 4 cylinder can make the 250-300 hp required for a small **** box car to have acceleration on par with most modern cars on the road while also being able to throw down 20-30 mpgs. But they don’t test mileage at heavy throttle inputs. Same with smog. They do all the testing under very light/no load situations where efficiency is high and power output is low.