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OK. So I've completed the trip, there and back, 400 miles each way and two tanks of Tesco 99. Economy: At an average of 65mph I had enough fuel left for 70 miles. I think that's at least no worse than the same trip previously on 95 octane, maybe a little better. Running: The engine always...

I reckon I'll give 99 a go. By time I get there I'll pretty much have used the full tank, then another one to get back next week. Should have a good idea by then if the exercise has been worthwhile. As long as I'm not going to do any damage to the engine then it's worth a shot (can you tell...

Wow. Instant response (a bit like an Audi engine)! I'm on a 400 mile trip tomorrow hence the original post. Tesco is closer than Shell, plus I have a Tesco Clubcard, so I'm tempted to try a few tanks of 99 and see if there's a noticeable difference.

I know the fuel thing has been done to death, but I have a slightly different slant: I have a 1 year old A3 1.4tfsi. To date, I've filled the tank with mostly supermarket 95RON and am pretty happy. However, after reading some threads I'm wondering whether there's value in using either of...