especially for a medium horsepower car like the GTP… Sunoco 110 would be fine if you are using it just to test an issue. I believe a good part in my motor popping was due to the shitty Sunoco 112… I should have had C16 in it for that kind of horsepower, but there was none around. So I settled for the 112, which costs me a lot more $$ than the difference in good fuel. Expensive lesson learned!