I get 18 miles per gallon mpg with this combo with a del sol would I get better economy if I picked up the ecu specifically for this car from honda? its got the header and intake/throttle body of a d16y8 I think the ecu is the P08j just to clarify, I bought the Car with that ECU and Engine Combo, Is it worth getting a P08J put in, will it put my fuel economy up? does the displacement make a major difference? where should I get the p08j? how much is reasonable to pay?