|
No of course it doesn't need 98 to run, my point was you are silly not to use it. On 95 as you say it retards the timing (when I say map I mean that it is all done with an ecu these days not manually) and thus you get a reduction in power.
In the case of the N54 and N55 that reduction is massive.
I dropped nearly 30hp using 95 ron, I only found this out as I thought I had an issue with my car, so took it into someone I use for tuning and he rolling roaded it for me. Turns out after lots of head scratching my wife had filled up with 95.
After a couple of tanks of 98 it felt back to being lively again, it had its bite back, we put it back on the rolling road and sure enough the power was back.
Just to double check we put 95 back in.
I do the same run from Wymondham to London all the time, so can go through a tank of fuel every 2 days, and this allows me to test MPG between cars and fuels quite easily and it is very consistent.
95 ron used to be 26mpg no matter what, if you left the OBC it would always end up back at 26mpg in the end, however on 98 ron it would always end up at just over 29mpg.
The fuel usually cost around 5% more to go super unleaded and I saw a constant 10% improvement in mpg and a massive difference in response on the car.
As I said, bit silly not to use 98 in these cars.
In a world where people have always spent £10' of thousands on petrol cars to see a 30hp increase, being able to get those gains by using the right fuel is a surely a no brainer. When you consider you don't even spend more in real terms because of the mpg gains it is even more of a no brainer.
|
|