i have a 1992 honda accord mt 2.2l. It gets good gas mileage on highway but horrible in city. 30 mpg hw and about 17 in city. It use to get what it is suppose to get(22 to 25mpg in city). Spark plugs have been changed, air filter.
There has to be something that causes bad city but good highway gas mileage. Maybe a poor spark at higher rpm's while accelerating as to cause big ineffeciency in city cause there is alot of acceleration in city? I am just wildly guessing here.Does anyone know or can help?

 

Check tire pressure, and possibly fuel filter,usually a problem affects both mileage.I't also possible the thermostat maybe bad ,if it is the engine is constantly running cooler and causing it to run rich.

 

there are so many causes for bad mileage ranging from oxygen sensors to climate. to name a few oil,plugs.air filter,tire pressure,clogged injectors, fuel filter also driving in the winter cold gives you worse mileage and the winter gasoline blend givers you worse mpg.

 

Yes i know this of course. This is something really specific as it only gets bad city mpg and still gets great highway.

 

yes but if you couple that with stop and go city driving you come to this conclusion.