24miles per gallon. CITY (2004 limited auto, 95oct)

I live in Iceland and there are no straight roads, it's all up and down hills with traffic lights on all corners...
I think i might get it to 26/7/8mpg if i ease my foot on the pedal a little bit, change my 8yr old spark plugs and clean my throttle body.

I've used STP Fuel Injection cleaner a couple of times since i bought the car back in september 2011 and i've found little-ish improvement
in mpg both times. Maybe its just in my head :l