SIDEXIT

iTrader: (1)

would adjusting valves like after a 110k service improve gas mileage?

EG2Driver

Theoretically, i would think the changes would be minimal at best. How old is your air filter? Plugs? Wires? Dizzy cap? Rotor?

SIDEXIT

iTrader: (1)

possibly about 109,xxx miles old i believe.

changing all that would increase gas milage?

SIDEXIT

iTrader: (1)

the only thing that is changed is my air filter. its a dry flow aem so i clean it every few months or so.

Probot

give the car a complete tune up - change everything EG2Drvier mentioned and also replace your fuel filter, maybe get some injector cleaner. But you aren't going to be getting mpg like a Prius or anything..if you drive fast everywhere you might just want to cool it a bit, it helps.

SIDEXIT

iTrader: (1)

well i don't drive fast. its a auto civic. i'm just starting to notice a little decrease in mileage that's all. was wondering what would help that.

thanks though!

Probot

np dude - its just funny when people rocket ship everywhere and wonder why their gas mileage sucks

EK_B

Also make sure the air in your tires are up to spec.

DeadPixel

I had the same problem on my '93 DX. bought the car after 110,000 miles and it used up to 13litres/60miles. I changed all filters, oil, checked for leaks and changed head gasket, cleaned the throttle body (don't want to know where that car has been driven by its previous owner...), had the wheels aligned, bought new NGK spark plugs and MSD wires and the gas mileage improved a bit. The car felt a bit more responsive as well. But don't expect any magic. had about 10.5litres/60miles afterwards but the engine was in quite a bad shape at the time of purchase so i just used it to learn on it - before i crashed with it

conclusion: i'd say the better the condition of your engine, the more chances you have of improving you MPG.

good luck