Premium or regular gas for a 99 civic si?
 

My manual says that the engine will compensate for regular unleaded gasoline. How will this affect my engine/performance?

You'll get an unnoticeable amount of power boost from using premium. I still try to put premium if I possibly can, regular gas gums up in a year! That scares me...































If you want to see how I really feel...































92 Civic Hatchback ~ 312 turbocharged wheel horses from same engine you have.















ALWAYS PREMIUM maybe with an octane booster!































05 Nissan Titan















Very rarely put regular because it makes it knock even though thats what it calls for!































05 Honda accord 4cyl















Usually put regular, tank of premium about every three tanks. This is probably because it's the wife's so I'm not as **** about it...