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D-4Direct Injection 4 Stroke Gasoline Engine (Toyota)
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The new engine will be an updated version of the D-4 engine, Toyota's first gasoline direct-injection engine put on the market in December 1996, the officials said.
The miniPDD uses about one fifth the amount of helium as the proprietary D-3 and D-4 versions, giving up only a bit of sensitivity and dynamic range in return.