Here’s another product to add to your Earth Day shopping list. It’s the ScanGauge II from Linear Logic. It’s a trip computer for your car that provides a realtime miles per gallon display. It’s almost like having a Kill-A-Watt Electricity Monitor for your car. The Digital Gauges give you realtime data for your vehicle and the built-in Scan Tool allows you to read trouble codes and diagnose potentially expensive problems before they get out of hand. It easily installs on cars newer than 1996.