I've been thinking about buying a OBD-II Scan Gauge, which claims to read out a whole list of parameters in real time, including fuel economy. Does it actually work on a Honda? Particularly my '02 Accord? I'm just wondering if fuel economy information is even available for this device to read since my car doesn't have a trip computer in the first place, and I don't believe Honda had one in any trim level. Does anybody know?