njresler

I've done 43-45 on a long trip by staying under or around 65mph with regular 87 octane. But find with higher octane I'm getting that at 70mph.

I've just looked at avg mpg with them and get a 10%+ improvement. Also gets going to interstate speed smoother.

Went from indy to Chicago area 460 miles round trip. Averaged 45.5 mpg on the drive up and after driving around town and back still had an average of 42.3 mpg total trip. 70mph on interstate. Did try to stay a safe distance behind vehicles to draft and was using a/c for most of trip

I don't know for sure. But isn't the engine in the spark a high compression engine. I'm aware that the higher octane combusts easier. But I seem to have a smoother running car and all together better performance with higher octane.

I have noticed a big difference with 92/93 octane fuel. I get better mpgs and more power.

34mph

34mph

45 is my best average on a trip all interstate at 65mph

Try 92-93 octane fuel and maybe even an octane booster. I'm getting ~40mpg now even at 70+mph

Running premium gas 92-93 octane greatly improved performance and mpgs. Especially at 70+mph. I'm averaging around 39-40mpg now.