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Purchased my civic a year ago & I'm getting 26-27 mpg out of it when it should be getting 36. It's a freeway commuter with 60+ travel miles one way. Odometer is at 87,000. Put new tires on it & monitor the psi, had the O2 sensor checked & replaced, valves were adjusted, & transmission fluid flushed. Nothing has changed except occassionally I get a whiff of atf. Any ideas?

 
Rep Power: 367

have it always had that MPG or did it drop recently?

 
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It's always been low. Might not have bought it if I had known.

 
Rep Power: 367

Driving styles largely affects MPG.
if 2010 do not have the MPG display, get a OBDII connector and use your phone to monitor MPG.
Like, when driving downhill, if you release the gas pedal completely in gear, it will show 9999 MPG, because the fuel injection will completely cut off the fuel. If you touch the pedal, fuel will be injected.
This is one of my ways to save fuel. If there is no need, I won't use the fuel.

 
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Im a fairly conservative driver but I know that mpg will fluctuate. However it's still a highway only driven car & I should expect to be within at least 5 mpg &.not 10 away from 36 hwy.

 
Rep Power: 243

Are you in a mountainous area? That is rather low for highway miles. Are you keeping your speed below 70?