Hi I have a 93' civic with a b18b1 when I got it back from the shop ( fix pistons now has high porformance piston ) it was giving me super bad mpg then I checked the codes and I had no map sensor tp sensor was bad and code 22 I think vtec solinoid I bought the map sensor and adjusted tp sensor that fixed it a little but I notice it still drains more gas then what I expected for a 4 cylinder !! I noticed that the higher rpm more gas it drains but I don't even go over 3000 only on 5th gear...also I notice the needle goes down a little and goes back up but not to where it was at first ! Well I want to know if any one know what I should check or change ? Thanks in advance to any help I get very appritiated !!