I was wondering this morning, with a high compression engine would the Elio need premium octane gas to make the 55HP and 84 MPG? I know that in a lot of modern engines requiring premium you can put in lower octane gas and the ECU retards the timing to prevent pre-ignition but that cuts power and MPG quite a bit. Apparently the 11:1 CR Coyote 5.0L Mustang engines are like that. They specify premium to get the advertised numbers but a lot of owners run regular to save money and just take the performance hit. Has there been any mention recently from Elio about what grade gas we will need? Searching online only turned up speculation from 2014. The difference between grades would mean an extra $2 per tank fill up. With the increased MPG over other cars it is still a big win.