I've realized my e30 uses as much prem as a Z06 Vette

[Kershaw]

i get 28mpg on my e30es with regular.
i get 18mpg on my rx8 with premium.

my e30 saves me $200/month in gas.

[payney8]

yeah i thought you guys had a different system measurement.

[Adrian_Visser]

dang 91 is topshelf premium over here
and only one 76 gasstation that sells 100 octane but only 1

91RON=87AKI

It's the same octane just a different system of measurement. See my above post.

[caliGreen]

normal is 91 octane, then premium is 95 then you can get what i run which is 98 octane its called ultimate. about $1.41 Aus a litre

dang 91 is topshelf premium over here
and only one 76 gasstation that sells 100 octane but only 1

[payney8]

whats pemium down there? in the US we have 87, 89, (sometimes 91), 93 at most stations.

normal is 91 octane, then premium is 95 then you can get what i run which is 98 octane its called ultimate. about $1.41 Aus a litre

[bmwstephen]

is it impossible for m20s to get into the high 20/30mpgs?

my car is an auto with a 4.10 and i got more miles out of the tank using 91 than my e46. With my e30 I got close to 350+ miles out of the tank for $30 (30 bucks gets me a full tank in my e30). My e46xi gets 325 miles if im lucky and costs me $50 bucks a tank. which is odd because both of them are 16.6 gallon fuel tanks,

[Holland]

I get mid 20's with the M10, and that's with the 3.91, and my not so efficient driving.

[thebutcher37]

I feel lucky that im getting around 21-23 with my 318is coupe!

[Adrian_Visser]

it even states right in the owners manual to use nothing less than 91

So much mis-information in this thread.

Do you even know the difference between RON and MON octane rating?

Or for that matter anything about octane ratings at all?

Obviously you do not.


In Europe the RON octane rating system is used in North America the RON+MON/2 system is used this is also called the AKI rating. Basically it means that in north American the octane rating on the pump is four or five points lower than in Europe and many other countries using only the RON rating.

[blackICEbomb]

it even states right in the owners manual to use nothing less than 91

[Fusion]

23mpg usual driving @ N95
27.5mpg best @ N95
19.5mpg track day, highway, city @ 5.3gal of N100

[StereoInstaller1]

Higher octane also burns a bit quicker. IIRC running higher octane in a car rated for lower octane produces pre detonation.

No, exactly opposite. Higher octane burns lower temp and slower, that is how it reduces detonation and pinging.

[blefevre]

I get gas when I need it, fuck mileage. Dollar for dollar you are not going to find a more fun and exciting car.

I agree.

I manage 25mpg with a chipped M20 with a 4.10 driving mix city/highway. I think that's pretty darn good for a 20 year old car, I don't drive light either.

[caliGreen]

full tank gets me about 235miles on 87
and 91 gives me about 260 on 91
drive the same.. but i know ther is lots of variables
al stock

or maybe its me

[BMWerke]

my '90 325is gets 16.5, its an autocraptic