Instantaneous feedback is important to me. I have two daisy chained scan gauges and the Prius MFD. I monitor RPM, SOC, IGN, Tank Ave MPG, Instantaneous MPG, Water temp, and two different Current Ave MPG's. That is 8 gauges total. In city driving I watch the MFD arrow display to help engage and control stealth and warp stealth. I use RPM and IGN to help engage and control super highway mode. I also have a GPS which I use to monitor cruising speed (highway) and elevation.
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