How much of a difference does it really make? I always have put 93 in my car, but if gas goes up to $4 a gallon I'll have to start putting the regular in the car--I'm 17 and don't want to spend all my money on gas. I only drive like 300 miles a month or so, most of it in town. Bone stock 2009 GTI.Not chipped? Use regular. Gas is going up again, to $4 within the year.
DarkX, you've been giving some incorrect info down the line somewhere. Your manual may specify 98 RON, but ours specifies 91 PON, which is NOT the equivalent of 98 RON.
Yes, henwee, there should be. :wink: And it is marked in both PON and RON :wink:91 min
There should be a sticker on the inner side of your fuel cap lid to remind you.
Octane Rating Calculation Methods
There are various calculation methods, RON, MON, and PON or AKI.
RON: (Research Octane Number). Most common fuel used in Europe, Australia and some other Countries.
It is determined with measurements of fuel behavior in a variable compression engine.
Results are compared with other iso-octane fuels, which means,
compared with other fuel types with equal number of similar octane molecules present,
but not the of the same organic compound.
MON: (Motor Octane Number). Determined also with a variable compression engine,
but with the fuel already preheated, variable ignition timing and higher RPMs than the RON method.
This method is more precise on determining fuel behavior on an loaded engine.
PON or AKI: (Pump Octane Rating or Anti-Knock Index): This is the method used in USA and Canada,
expressed as [R+M]/2, which means RON number plus MON number, divided by 2.
In other words, it is the average between both methods above.
So, due to the fact that RON is always from 4 to 5 points higher of its equivalent to PON or AKI,
the number conversion between USA and Europe octane ratings will approximately be as follows:
USA (PON) –> Europe (RON)
87 –> 91
89 –> 93
91 –> 95
93 –> 98