SuperTech from Walmart works for me. Just add to regular tank of fuel. If its been awhile I would add a bottle to 1/2 of a tank instead of the recommended full tank.
30 weeks of computerized fuel systems classes taught me that the "tune-up in a bottle" is a bunch of crap.
There are two effective cleaning methods but they require tools.
First to clean the fuel system(exam question from yesterday) There is a method that involves disabling the fuel pump and running an EFI car from a pressurized can. Do not let the pressure go above the regulated pressure or the Fuel/cleaner mix will end up in the tank. Run the vehicle until the can is empty.
Induction cleaning uses a high pressure spray(looks like a nitrous spray bar). It goes in the intake stream before the T-body and cleans everything the air hits.
The only thing I was told the in the tank bottle was good for was to ruin the injector coils.
You want to always run the lowest octane possible. Higher octane has less of an explosive quality(energy). Run the lowest you can without detonating.
Detonation is the key(two flames fronts running into each other). Detonation with high energy gas will not be anywhere as fast as no det. and lower energy gas. No detonation means there are no opposing forces against the piston.