We've had a few days of rain here in the Bay Area. I had to go shopping, so I tried my 25-40 mph P&G routine with lights and wipers on (required in CA when it's raining) back on my test route. I got 53.1 mpg, surprisingly good for having to charge the battery during pulses. Furthermore, I was able to keep my battery at or above 11.6 V during my experimenting. Then I tried P&G NICE-on with lights and wipers on, to see how much it hurts mileage, and got a reasonable 47.8 mpg with my 25-40 mph routine. Finally, to calibrate, I did a run without lights and wipers, and got 55.7 mpg, about my norm. Summing it up, lights and wipers only hurt my mileage about 2.6 mpg, or 5%. NICE-on hurts my mileage about 5.3 mpg, or 10%.