Since I never use 'corn-gas' (E-10) in my mowing equipment, only 100% real gas. I have been using it in my HHR as well.. With good results.

 

HHR's like the Ethanol free "Pure Gas", seems to perk 'em up nicely, especially when they have a "Tune" applied like a Trifecta Tune.

To find stations selling Ethanol free gasoline near you, check out this site....

Ethanol-free gas stations in the U.S. and Canada

 

I run Shell V power in my BB car and our race car with good results which is posted on that site. That's some good info to have.