In a test you need 3 things;
Fixed Variable
Manipulated Variable
and Controlled Variable
if 10+l/100km per mentioned is not good for you, then I don't know what is enough. It is also number?
If highway drives are mostly the type of mixed drive you take for the pre 95 extra fuels, then the same type of mixed drive should be taken to be used as a fixed variable. Because we don’t expect people to actually do a thorough fixed test in a fixed course. And in the case of the old Primax 95 user, I believe to this kind of staged test can’t be achievable, because Primax 95 has been phased out, so the best controlled variable to be taken here is, from the previous run we had in Primax 95, thus the best way to make a comparison, IS to run in a similar type of drive, and compare the result.
If you're not sure on what type of fuel to be used for your e60, there's a conclusive evidence for you to refer upon;
1)Re-read the whole of this fun and humble opinion filled thread or use the search button. (It has been mentioned over and over again)
or
2)Read what's written at the back of your car's fuel cap (Hope this help; they're given by Germans, BMW engineers to be specific and not Butt-dynoed by Malaysians or people here in the forum)
So I shall now humbly specify the guidelines for further discussion on this thread, to avoid any further miscommunication or any miscalculation of measurements or even non-conclusive measurements. (It’s okay if you don’t want to follow, but it won’t be scientifically proven though);
Fixed Variable: The same car + The same type of driving pattern
Manipulated Variable: Fuel used before Petronas Ron 95Extra and Petronas Ron 95Extra
Controlled Variable:Result obtained from Pre Petronas Ron 95 Extra (of the same car and of the same driving pattern)
Note;(driving pattern also include how hard you push your throttle.. it must be constant with the previous test)
P/s: If you car doesn’t come with an OBC;
1)Fuel your car to the brim
2)Drive around at pre designated course
3)Fill it again up to brim (Take note of amount used)
4)Divide it with distance travel.
5) Repeat steps 1-4 with another type of fuel.
6) Compare result.
Yours Truly,
Mr. E34 that doesn’t come with a modern OBC and had been driving it for years and only came to this forum after acquiring it.