~11 months ownership, 12,285 miles, just under 15 gallons added (started full, most recently filled it last week). Assuming 45mi/gal, I'm about 94.5% electric and 5.5% gas.
The Clarity replaced a 12 yr old Honda Civic as a commuter car. Since my work has charging stations, I was planning to get a Prius like several coworkers. Ended up with the Clarity and love the big upgrade in comfort and features compared with the Civic. Compared with the Prius, it is much more comfortable to drive and very rarely needs gas for my commute, even during the colder months. Overnight family trips are in my wife's SUV, so that keeps the gas use low too. Most months, I schedule a day to use the ICE, which probably accounts for a third of my gas miles.
In retrospect, my needs would have been well met with a full BEV, but you couldn't have convinced me before having the PHEV.