Fuel Tank Reference:
Focus ST – 12.4 gal
Focus RS – 13.9 gal
Ecoboost Mustang – 15.9 gal
Mazdaspeed 3/6 – 15.9 gal
Flex Fuel Calculator
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Note: Ethanol content can vary by station/season. Always test your E85 and enter the actual % for best accuracy.