I had 0903(evap canister vent control valve) and 0705 (Evap control system) codes.
I bought a new canister, valve and a gas cap, and since then no more CEL

I also passed inspection yesturday.

The parts were replaced a week ago and ECU was reset. I see little to no improvement in gas mileage, so I will see how it goes for few more weeks.
I get 14-15mpg driving in Brooklyn stop and go traffic(no highway).

 

15 MPG?!?! wtf i get 22 sorry no positive comments here that would be beneficial...

 

their city driving is way worst than ours and his feet probably heavy as hell....lol

 

Yeah, the city driving here is terrible; too much traffic lights , stop and go every minute.
I don't have a "heavy foot" , and usually my auto tranny shifts at 2500 rpm.

I spoke to NYCMaximas.org members and most of them get 15-17.5 mpg (both 4th and 5th gen). Some 5th gen get 20-21mpg.