I'm coming from a MINI Cooper S convertible to the IS 350 C. The MINI was always very finicky on gas - you could tell a difference going from Shell to Exxon on how the little engine ran. I got to where I would only use top tier (Shell and Chevron) in it to keep it running good.
Is the IS 350 motor as particular on the fuel you use? What gas have you guys had the best luck with?
On a related note, I developed the habit with the MINI of 3K mile Techron Fuel Injector cleaner treatments. Keep that up with the new ride ya think?