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Hello! New member's first post. Recently bought a s4 b6 avant - very happy with it.

In view of the current petrol prices, do any of you guys run yours on normal unleaded as opposed to super unleaded? Any views or feedback would be appreciated.

cheers

Yes. I do a hell of a lot of miles so have always stuck to 95 RON with no ill effects. I've also had plenty of run-ins with other cars, and mine's performed as the figures on paper suggest against them.

I've read plenty of times about the supposed increased frugality using 98 and above, but I've also never seen a definitive test to back this up. Maybe someone on here has and could link to it?

Considering the book average mpg is 21.2, & mine's on 23.3 (20% urban, 50% m/way crusing, 30% outright hooliganism), and that book figure was probably generated using the recommended 98 RON, I've never felt the need to pay for the higher grade.

Hi youngjon

I've had my s4 avant for about 3 weeks now and have put 1 tank of super in and 2 unleaded. I've not seen any difference in performance or mpg. Only got 17mpg average out of first 2 tanks!!
Loving the car even if i do only get to drive it at weekends.

Dunc

A thread taken from tyresmoke.net. The 4.2 V8, non FSI. One bank is supplied with 95. The other with 98. Higher octane fule provide more than perofrmance. They have cleaning agents that 95 do not contain.

http://www.tyresmoke.net/ubbthreads/sho ... w/1#UNREAD

thats a bit of an eye openner. Mind you, don't think it would be that bad if you do 95 every other fill, but reading that it should be 10% better on fuel with super theres no need to use 95 ron

I didn't think it was saying 98 has agents that 95 doesn't.

I thought it was saying that "our 98 has cleaning agents and this is the difference against the crapiest 95 we could find".

As if a petroleoum company would try to make the comparison as extreme as possible!

I ran a 1994 Subaru Justy on Optimax/V-Power for 2 years because the cost per mile was lower, thus making the detergents an added bonus. I did the same a few years ago with a 1992 Range Rover for the same reason. I tend to monitor fuel consumption quite closely as it is often the first warning of a component failure. The VAG trip computers are not 100% accurate for the actual MPG figure (though you can re-set them to eliminate this) but you ought to see a slight improvement on full-strength unleaded and similarly a slight deterioration if something starts to fail, usually well before any fault codes are stored.