Really bad MPG

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Joined
25 May 2004
Posts
1,423
Location
Belfast
Im constantly getting 20MPG with my car and its starting to hurt my wallet. I don't really do big motorway trips, and most of the driving i do is about 3 miles before stopping again, but even so I'd expect more than 20MPG from a naturally aspirated car. The car in question is a toyota celica GT. Anyone have any ideas on what the problem could be?
 
I did replace the 02 sensor sometime last year, but there has been no error codes. I've never gotten more than 28MPG out of the car even on long runs. Im kinda worried about it being the 02 sensor because its not a OEM one.
 
I had an agruement about coasting for the very same reasons just the other day :P

I do think an oil change is needed, as its looking quite black now. And of course the light for oil pressure is on every so often which i've been convinced is just a dodgey sensor, but if not then the engine might well go pop some day down the line.
 
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