I have a Turbo model and was wondering what kind of fuel you guys are using and are you happy with the performance. I'm running midgrade (89 octane) and its peppy with decent gas milage. but I'm wondering if I'm wasting my money and should just use regular. I'm not a speed demon but like the power when I need it. I posed this question to the service manager during the cars first oil change and he said I was wasting my money. The turbo was designed to run on regular. Not sure if I'm buying his story. Appreciate any feedback