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Originally Posted by Steeltwo
closed loop seems to be the culpurt to the change in gas mileage according to the keydriver guy.
i thought he accidently burned the chip to lean, but after he looked at the log, he said closed loop was causing the increase in mileage.
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I don't need a tech 101 lesson. For a DSM to go in closed loop it needs to be at a fairly constant speed, engine RPM and no drastic TPS changes. All DSM's should be running at closed loop on the highway, so there isn't anything special about yours. If you truely are getting mid 30's for gas mileage, you had better have an EGT. You are very lean. On a FWD it is doable because of the taller gearing, lighter weight, and less drivetrain loss.