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change to after market ecu get a aem wideband get a good reliable dyno tune then take the 5v output of the aem and connect to the ecu and goto the arf mapping and tune yourself from 1500rpm to 4500rpm and below -35.4kpa this can be set in the ecu software, I have mine set to afr 15.1 when cruising give over 550km per tank open road at 120kph no worries and 400km plus in town, above 4500 & -35.4kpa the ecu reverts to the dyno tune and chews fuel like hell (let the fun times begin) this is an old haltech e8, the new haltechs are easier to use have a platinum in the race car. you will have trouble with the idle when the a/c cuts in but this can be tuned out on the throttle response maps.