91 Octane Premium


Asked by Jul 24, 2016 at 02:36 PM about the 2009 Ford Focus SES

Question type: General

I have a 09 Ford Focus 2.0L SES 4cyl. About a
month ago i had a K&N performance air intake
installed and a Performance race exhaust system to
increase air flow. Then not to soon after i noticed
when i came to a complete stop at a stoplight and
then started to accelerate, it hesitates and doesnt
want to move at first, and then it will take off like
normal. Ive been using 87 octane gas since i got the
car but i was wondering if i started experimenting
with 91 octane or premium would that benefit the
performance of the car at all? Thanks

2 Answers


Doubtful, it would be advisable to have it live data scanned, it is possible that a sensor is out of specs but not enough for the computer to read it as an malfunction.

1 out of 1 people think this is helpful.

The oil that goes on those K&N Air Filters contaminates the mass airflow sensor. HTH. -Jim

2 out of 2 people think this is helpful.

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