Standard Mini Cooper Hatch 2009 R56 - to answer your question.
I just want to keep my Mini Cooper well fed and healthy
You are correct we use AKI fuel ratings. "Ultra 94" from PetroCanada; I couldn't add the weblink so I copy and pasted the features of Ultra 94 below:
Ultra 94, the High Octane Advantage
Ultra 94's high octane formula surpasses the CGSB (Canadian General Standards Board) performance requirements for super premium gasoline.
What does this mean for your vehicle? Ultra 94's unique performance and higher detergency helps to:
Clean your car's fuel injectors and intake valves — and keep them clean
Optimize fuel economy
Improve overall vehicle performance year-round
Ultra 94's higher octane helps ensure you get maximum horsepower, acceleration and performance from your vehicle, even under tough
Petro-Canada™ produces and sells high quality gasolines designed to meet every type of Canadian driving condition.
Petro-Canada offers three grades of gasoline across Canada, and a fourth grade in selected areas:
Petro-Canada Brand Name
SuperClean 94, available in Montréal
All Petro-Canada branded gasolines contain Tactrol™, a proprietary deposit control additive, sometimes called a gasoline detergent, that is designed to keep fuel systems clean.
Petro-Canada has supplied Canadians with high-quality fuels that meet their driving needs for many years. This track record, and the fact that our fuels meet or exceed all Canadian standards, has resulted in our customers’ confidence in the quality of our fuels. To confirm the high standards of our fuels, Petro-Canada decided to participate in the Top Tier program as of Oct. 1, 2006.
Find out how Petro-Canada uses ethanol-blended gasoline in selected markets
Because A Cleaner Engine Simply Runs Better
Tactrol is our exclusive deposit control additive that acts as a detergent to clean and prevent the build-up of harmful deposits. Tactrol is used in all grades of Petro-Canada gasoline — including RegularClean, PlusClean, SuperClean, Ultra 94, and WinterGas™.
SuperClean and Ultra 94 come fortified with an extra dosage of Tactrol — so it can actually remove stubborn deposits, help restore your engine's performance, and keep it clean.
No other company uses Tactrol except Petro-Canada.