hey guys, i just bought a 99 civic ex coupe, 5speed. its a great little car and gets excellent gas mileage. i have a mustang as my performance car and i just bought the civic so i could garage my mustang (its a 95 and only has 40k miles on it). anyways, i had two questions:
1) the car has 135k miles on it. i can tell it was well taken care of. the timing belt has been changed. is there any other preventative maintenance i should do now, considering the age of the vehicle? everything appears to be in good condition, i'm just new to hondas.
2) are there any 'free mods' or relatively cheap performance mods i can do to increase the power without sacrificing fuel economy? i don't want to do anything that will make the car sound ricey. for instance, i was wondering if i could advance the ignitiontiming at all and still use 87octane? and how could i advance the timing?

thanks in advance,
jason