Mercedes CLA Forum banner

1 - 4 of 4 Posts

·
Registered
Joined
·
35 Posts
Discussion Starter #1
Is anyone using or tried regular grade gas instead of premium or mid grade? Do you see any mpg and/or performance difference?
 

·
Premium Member
Joined
·
927 Posts
I wouldn't use regular when the engine calls for premium (at least 91 octane). Any lower octane level can cause knocking (premature detonation).
 

·
Registered
Joined
·
437 Posts
Be wary if you fill up at higher elevation and then drive to sea level. Octane rating is lower at elevation since knock is less likely at altitude, so you'll want to empty your tank along the way down so you can fill a fresh tank down low.
 

·
Registered
Joined
·
23 Posts
Is anyone using or tried regular grade gas instead of premium or mid grade? Do you see any mpg and/or performance difference?
Using a lower grade (less than 91) will also void out the Manufacturer's Warranty. With that being said, my dealer also told me that it's OK to use 87 and no problem at all, but since I own my car, I'll stick to 91 just to be safe.

Hau’oli Makahiki Hou Everyone!
 
1 - 4 of 4 Posts
Top