The merge onto the highway this morning was with the usual 1500 RPM maximum, dramatically increasing MPG from the usual 30 to 90 by taking full advantage of the plug-supplied electicity. Upon settling down to a steady cruise at 70 mph with an engine RPM at only idle speed, still drawing heavily from the plug-in battery-pack, I noticed the instant MPG on my ScanGauge. 21.7 MPG! Huh? The instant MPG on the Prius speedometer was spiked at 100 and so were the minute-summaries on the Consumption screen. The ScanGauge MPG value kept jumping from a low in the 20's to the 80's & 90's. It clearly didn't understand what was happening. Is anyone else seeing older devices struggling to properly report data from new technology?
