By using a directly-injected stratified charge, it was supposed to be the answer to the automobile´s double whammy of emissions controls and fuel mileage requirements.
In D-4 direct injection, fuel and air is injected directly into the cylinder, instead of mixing it in the intake port which is how conventional fuel injection works.
Ford began to change last summer, when as part of the Alliance of Automobile Manufacturers, he threatened to sue California over the nation´s first-ever legislation to reduce vehicle greenhouse gas emissions.
Alas, with the total focus on clean emissions in the late ´60s-early ´70s, fuel mileage was completely overlooked, with the result that experimental steam cars of that era got worse fuel mileage than comparable gas cars.
Due to ethanol´s lower energy per unit volume, it should take more fuel to maintain a stocheometric (perfect) air/fuel ratio, which all newer vehicles will attempt to do (closed-loop fuel control being pretty much standard for the last 20 years).
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