My 1.8 is the limited Flintstones Edition. Regular or Supreme doesn't make a bit of difference: it's all about how many passengers and whether or not they're wearing shoes...

I run the premium in all my cars. My S4 & TT are chipped so I have to run it, and I've found that my 3.0 B6 gets much better gas mileage and has better power with the premium. It's a couple of dollars more a tankful, but it's worth it.

Yeah the cost of premium fuel will be cheaper over the years than having to fix or replace major parts. Premium is a must.

The difference is only a few $ per tank at the pump. You're better off paying a few $ more each time you fill up, rather than hundreds, if not thousands of dollars later in repairs.