well in my sephia every oil change i use that max life oil additive just cause it does have 120,000 miles so every lubracant can help specially the beating it takes from me.
other than that i only use octane booster once in a while just to keep things clean. no brands in specific I try a different one every time.
I use the STP Octane Booster and the STP Fuel injector/carb cleaner. It works pretty good. It boosts gas mileage a little bit. And every little bit helps here out in Cali. Cuz the gas prices are like 2.60/gallon for reg unleaded.