![Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora](https://qph.cf2.quoracdn.net/main-thumb-627698769-100-zblptgbjbeaqpfmqinjctvbzoiemujmw.jpeg)
Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora
![Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora](https://qph.cf2.quoracdn.net/main-thumb-14378772-100-3vBP7KfYrGZZlcU3luw3kbkOpfVBRfsb.jpeg)
Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora
![Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora Fuel Efficiency: Has anyone compared the cost per mile/km for the different grades of gasoline (with octane nos. 87, 89 and 93)? - Quora](https://qph.cf2.quoracdn.net/main-thumb-140701773-100-afnltyumbkpeokzzbkqnyvejdkmobkhx.jpeg)