I've never used it personally...however I've never heard it recommended by any tuner or garage. If £15 of "whatever" in your tank improved fuel efficiency and regained lost power wouldn't you be having it as part of your service? Wouldn't the government be handing it out for free?
Mythbusters have tested various fuel efficient products and none of them have worked under scientific testing.
http://mythbustersresults.com/episode53
The coupe de grace, however, is a basic internet search. 100% approval with comments like "now my car pulls like a train", "much better throttle response" and "it has transformed my car". In other words, snake-oil.
IMEO
Edit: BTW what price did the tyres come out at?
Mythbusters have tested various fuel efficient products and none of them have worked under scientific testing.
http://mythbustersresults.com/episode53
The coupe de grace, however, is a basic internet search. 100% approval with comments like "now my car pulls like a train", "much better throttle response" and "it has transformed my car". In other words, snake-oil.
IMEO
Edit: BTW what price did the tyres come out at?
