Potential answers for "Made run better, as an engine"

⭐⭐⭐⭐ TUNEDUP
⭐⭐ EDIT
⭐⭐ SPEDUP
⭐⭐ TOPPED
⭐⭐ IDLE
⭐⭐ PURR
⭐⭐ EASED
⭐⭐ ENHANCED
⭐⭐ AMELIORATED
⭐⭐ SPUTTER

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