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Maybe a bearing ?
Handbrake ?
If not something like that, an o2 sensor that is bad would drag down fuel economy. So replacing that could help.
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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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