What kind of gas does a Ford Focus ST use?
What kind of gas does a Ford Focus ST use? You can run 87 with no problems. The car is rated for 87 and there won't be any mpg difference. The ST engine is actually low compression (9.6:1 iirc) so octane needs when not on boost are not that high. The engine management won't have to pull timing, so you will get the same mpg as you would with mid-grade or premium. What kind of gas should I use for my car? What octane gas should I use? You should use whatever octane level is required for your car specified...