I suggest adding converting to LED lighting for headlights, taillights, reverse lights, turn signals, brake lights, licence plate lights, dash lights, etc to the list of 65+ mods for improved efficiency under the electrical section. When I converted my headlights, taillights, license plate lights and parking lights on my 2005 Civic to LED, I noticed that turning on the headlights no longer bogs down the engine at idle. I then converted to all LED lighting. As for a mileage increase, not sure, but it definitely didn't hurt
