Range Technology RA002 Range Technology V4 PLUS Fuel Economy Device Save 35-40 gallons per year on older, 4 speed GM Active Fuel Management Vehicles. Installs in seconds! Plugs into diagnostic port with no tools needed. Works to enhance the factory Active Fuel Management functionality and keeps all safety features. 8000 hours and 100,000 miles of testing have shown the average driver can save up to $150 per year and up to $900 over the life of the vehicle. No reflashing or reprogramming the ECU.