Originally Posted By mr_tony
25mpg is about right for an S1 for a mix if driving.
If you want to solve the air locking I can recommend replacing the fuel filler cap with the Simmonds milled aluminium one.

It works a treat, looks nicer and is more aerodynamic. I had one fitted to my s2 and it made filling up a whole lot easier..


Seconded.. I had one too..

See

http://www.simmondsshop.com/2-alloy-flush-locking-fuel-filler-cap-136-p.asp


Phil Egginton
1979 4/4 4 seater