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Hmmm... I think the manual is lying to you: http://www.fuelly.com/car/subaru/impreza
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Next time, fill the tank and zero the milecounter. Drive, then when you fill it up again make a note of the number of litres it takes to fill up and the number of miles done - then you can work out the MPG.
The fuel gauges are not very accurate.
Good luck doing the plugs :P
Soul
danb
@IR
My tank holds 50l I've covered just over 100 miles since my last top up and I'm 1/2 way through it if the petrol gauge is to be trusted. That means I'm doing 18-19mpg and mileage wise I'm about 80% motorway/country lanes and 20% non rush hour city driving.
There must be something pretty wrong with my car I reckon, odd as it appears to run fine and performs better than I was expecting. One thing I noticed is that somebody replaced the stock exhaust with a 1" pea shooter backbox, could this be messing with my fuel consumption?
I'm gonna replace the air filter, plug and backbox hoping that'll claw back some miles to my gallon. I should be getting 29-33mpg according the manual.