[island911]

Originally Posted by red-beard

The 92 Octane fuel without ethanol has more energy.

If it is truly dry, ethanol has 53,956 BTU/gallon while gasoline has 116,090 BTU/gallon. The 93 Octane has 109876.6 BTU/gallon. But all this will do is reduce your mileage by ~5%. The real problem is it attracts moisture, which means up to 10% water, which will make 98267.6 BTU/gallon, or almost 15% less mileage. Reality is it will be somewhere in between.

The 93 Octane fuel CAN produce more power IF the engine has higher compression and the timing is set properly. But between 92 & 93, it won't be much,

The other thing, that pure gas will probably be a LOT more expensive, since it is not made in the giant batches like the E10. So any mileage gain will be lost in the $/gallon. And any performance gain by the 93 Octane will be minimal.

Part of WW2 air war was won by 120 octane fuel

THIS^

My 911 goes much further on a tank of 92 octane 0% ethanol than the typical. I was seeing ~10% better.