awesome car, easily moddable, responds very well to maps, induction etc.
reliability wise, if maintained.. coilpacks, mafs prone to failure, leaky door seals... bout it.
bombproof engine if looked after.
make sure cambelt and water pump is done at 60k, change pump to metal impellor type.
mpg wise, depends on driving style, rag it and youll see low to mid 20s
drive it properly and learn
how to use the throttle and should see 30-32.
good runs have seen 35-38mpg
average id say would be 27-30mpg
run it on good quality fuel 98ron+, vpower etc.