oh, biggest "simple" killer of fuel efficiency is a inlet manifold leak, possibly around the injectors or throttle-body somewhere. This would explain everything. Spray with hydrocarbon-spray till you find a vacuum-leak.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
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