Get K&N!
95 EX Coupe Manual, 127k miles, all city driving - stock other than coilovers (pretty slammed)
Grease Monkey Air Filter, city driving, ~30mpg
Add K&N filter, no ECU reset, all city driving: ~35mpg
K&N filter, reset ECU, still all city driving: 37mpg
K&N, reset ECU, w/75 highway...