Potential answers for "Prefix with efficiency"

⭐⭐⭐⭐ ECO
⭐⭐ WELLOILED
⭐⭐ EPA
⭐⭐ STREAMLINES
⭐⭐ ETA
⭐⭐ SYSTEMSANALYSTS
⭐⭐ SUV
⭐⭐ STEPSAVER
⭐⭐ SAVESTIME
⭐⭐ MPG

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