Not too good on feul, av 25-30, everybodys different, but generally in this area
No mechanical probs really, you may find a slight judder with clutch 1st gear when pulling off, sounds bad, but is not at all, just a common characteristic.
Take a couple of old cd's with you try out the stereo.
Check that there is a 3 button key (this is usually the master, will need this if copies are required)
No, not more than a couple of mpg, so i'm led to beleive.
Anyway, welcome to the club, happy hunting,
may would be a good idea to post in the wanted section, specifying age, milage, spec, colour as best you can
Deckie.