Why would your 4-cylinder 02 mitsu galant which is serviced regularaly have gas mileage in the neighborhood of 9 miles a gallon?

Why would your 4-cylinder 02 mitsu galant which is serviced regularaly have gas mileage in the neighborhood of 9 miles a gallon?
There could be many things that can affect fuel economy, from a bad sensor (somewhere) to driving styles and habits.
I assume when you say it is serviced regularly, you mean oil, filter, air filter, etc. This might be a issue beyond the normal maintenance schedule, such as O2 sensors, MAF sensors, temperature sensors, etc, etc.


I would recommend getting a dealer to pull codes (diagnostics thru the computer) and dig deeper.