@Casey Martin @DennisH Today I let my Clarity go to EV 0 and transition to ICE on its own. I did not engage HV mode myself nor did I engage Econ or Sport modes. Test was 18 min duration for 16 miles. Speeds 0 to 61 mph. Temps 44 to 46 f. Just routine around town driving and since traffic was light, I decided I could take some pics...and be safe at the same time. The link below will take you to a web page which has 5 sets of pictures, 3 pics in each set. They depict scan gauge data, the center stack and the dashboard. No more than 15 seconds elapsed between the 3 pics per set. The scan gauge is set to display... MXS...Hybrid battery cell max SOC (%), STC...hybrid battery SOC (%), HBV...hybrid battery voltage (volts) and RPM's. Link https://bdacomputer.homestead.com/ What I thought might be of interest to you are the pics of the center-stack showing energy flow...as a real life example of what should/could be displayed under actual 0 EV conditions going x miles per hour. The scan gauge data may prove useful if you hook one up to your vehicle for comparison. The million dollar question is...what does your energy flow show when you get the high revs? Right before? During? With any luck Honda USA and the dealership will provide all the answers...until then data may help figure it out. Surely others know more than I about what the energy flow should be/look like when in 0 EV state in the real world. Hopefully they will weigh in as well. More input/knowledge is a good thing. Anywho...hope this helps. Good luck.