FE instrumentation can be very important if you are new to FE driving and are trying to hone your FE driving techniques. I've been hypermiling for a long time and over the years have become attuned to what works and what doesn't in FE driving, so acquiring FE instrumentation had less of an impact on me. The main thing that FE instrumentation (SuperMID) did for me was to let me know that I was still getting good FE at speeds well over 50mph (after aero modding). Prior to that I tried to remain below 55mph as per traditional hypermiling techniques. It also allowed me to improve my mileage on flat roads, whereas before I got my best mileage on gently rolling terrain where I could FAS on the downhills. Getting the MID didn't improve my mileage very much, but allowed me greatly extend the performance envelope where I was getting this mileage.
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