Discussion
Just to add that I’ve noticed a quite startling increase in fuel economy on my RS Megane when run on 99. It actually works out significantly cheaper for me to use it if I can get it at a sensible price. Sainsbury’s super seems to be the best £ per mile.
The difference on the on board display is c. 33mpg on 95 and c. 44mpg on 99.
The difference on the on board display is c. 33mpg on 95 and c. 44mpg on 99.
v9 said:
Just to add that I ve noticed a quite startling increase in fuel economy on my RS Megane when run on 99. It actually works out significantly cheaper for me to use it if I can get it at a sensible price. Sainsbury s super seems to be the best £ per mile.
The difference on the on board display is c. 33mpg on 95 and c. 44mpg on 99.
That’s Interesting. Sainsbury’s super is only 97 octane too so far inferior to Esso, Shell etc The difference on the on board display is c. 33mpg on 95 and c. 44mpg on 99.
Stevey101 said:
That s Interesting. Sainsbury s super is only 97 octane too so far inferior to Esso, Shell etc
Yep, I was surprised how much difference it made. Never noticed it on any other car, so I suspect very much not all cars will show this. Never really noticed much difference in how it drives though. I’m pretty sure it says 99 octane on the pump, I’ll have a look next time I fill up
v9 said:
The difference on the on board display is c. 33mpg on 95 and c. 44mpg on 99.
Wow! Do you actually see that difference or is it just the on board computer?In my Accord diesel, if I fill with regular, the computer says 520 miles to empty but if I fill with premium it says 600 miles to empty. However I've never confirmed how accurate this is.
Matt_T said:
Wow! Do you actually see that difference or is it just the on board computer?
In my Accord diesel, if I fill with regular, the computer says 520 miles to empty but if I fill with premium it says 600 miles to empty. However I've never confirmed how accurate this is.
I’ve never actually done the sums but it certainly make a big difference between fill-ups. Seems to tally with what the display says, about 25% more mileage. In my Accord diesel, if I fill with regular, the computer says 520 miles to empty but if I fill with premium it says 600 miles to empty. However I've never confirmed how accurate this is.
I have a F83 and run it on premium fuel but it is just a high days and holidays car so doesn’t do much mileage. Standard will be fine too as the car will automatically sort out the lower octane rating. I see it as the equivalent of drink tap water or bottled spring water. Both are fine, just ones slightly better than the other 
TheAngryDog said:
Well, you're buying the worst version of the M3/4, but despite this you should still run it on Super Unleaded. Tesco Momentum would be fine, it's what I run my M5 on.
Why’s that? I get convertibles are not everyone’s cup of tea which is fair enough. Me personally I love convertibles and if your talking because it slightly lowers the performance with it been heavier due to the convertible roof and not the carbon one on the F82. Never really going to notice the 0-60 2/3 second difference or much difference in performance unless your going to be taking it on tracks which I absolutely won’t be. Plus I’m getting the competition so it’s 30bhp more or so than standard so that will possibly make up for it.
Stevey101 said:
TheAngryDog said:
Well, you're buying the worst version of the M3/4, but despite this you should still run it on Super Unleaded. Tesco Momentum would be fine, it's what I run my M5 on.
Why s that? I get convertibles are not everyone s cup of tea which is fair enough. Me personally I love convertibles and if your talking because it slightly lowers the performance with it been heavier due to the convertible roof and not the carbon one on the F82. Never really going to notice the 0-60 2/3 second difference or much difference in performance unless your going to be taking it on tracks which I absolutely won t be. Plus I m getting the competition so it s 30bhp more or so than standard so that will possibly make up for it.
Stevey101 said:
Me personally I love convertibles and if your talking because it slightly lowers the performance with it been heavier due to the convertible roof and not the carbon one on the F82.
I assume you do know that it isn't the weight of the roof that makes a 'vert heavier.It is the under-floor bracing that they have to fit to try to make the shell somewhere closer to the strength of the shell with the additional strength of having a solid roof fitted.
check the inside of your fuel filler cap and it will say what the minimum fuel you should run it on
My F13 M6 says "minimum 98 RON", so I give it the best quality fuel that's 98+ only. This generation of ///M cars are very sensitive to fuel and there’s a lot of garbage in regular supermarket unleaded and you don’t know what previous owners have been filling your car up with.
So for this reason I stick to the best quality fuels from Shell, BP Ultimate and Mobil only. It’s not just marketing guff, the best super-unleaded really does make a difference to performance cars and in Direct-Injection cars it significantly helps reduce the possibility of an LSPI/Super-knock event. I also run a high-quality PEA-based Fuel Injector cleaner every 2,000 miles to help keep carbon deposits at bay and to look after the injectors as best as possible.
My F13 M6 says "minimum 98 RON", so I give it the best quality fuel that's 98+ only. This generation of ///M cars are very sensitive to fuel and there’s a lot of garbage in regular supermarket unleaded and you don’t know what previous owners have been filling your car up with.
So for this reason I stick to the best quality fuels from Shell, BP Ultimate and Mobil only. It’s not just marketing guff, the best super-unleaded really does make a difference to performance cars and in Direct-Injection cars it significantly helps reduce the possibility of an LSPI/Super-knock event. I also run a high-quality PEA-based Fuel Injector cleaner every 2,000 miles to help keep carbon deposits at bay and to look after the injectors as best as possible.
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