My car failed CA emissions testing last week, and I'm confident my hypermiling had a direct relationship to the problem. When I took it in for the test, I hadn't driven the car in a month, except for a brief drive up the freeway to warm the engine up before the test. The failure was due to my clearing the check engine light/malfunction indicator light in October. Since then, I'd driven 800 miles, but some of the drive cycle monitor readiness flags hadn't been set since the MIL clearing. My Scion xB regularly triggered the MIL, with trouble codes P0301, P0302, P0303, and P0304, indicating multiple cylinder misfires. But they would all come on as soon as the ignition key was switched on, before the engine was started. I deducted this was because FASing told the OBDII the car was rolling at a speed inconsistent with the (presumed) idle speed timing advance. Once I installed a kill switch, the MIL issues went away. Except in October, during a road trip, a connector came loose, disabling my kill switch. I reverted to ignition key FASing, and my MIL came on, with the same P030X TCs. I reconnected my kill switch, cleared the MIL, and drove 800 miles with no issues, until my car failed the functional test, shown above. The smog check tech said a couple of the drive cycle readiness monitor flags hadn't been set since I'd disconnected the battery, or cleared the CEL/MIL. I asked what I needed to do to set the readiness flags, and he recited the common wisdom (you'll see it on the web) that I should drive the car for a week. He'd seen some people needing 2000 miles to set the flags. The Scion community saved me a lot of random driving. The catalytic converter driving cycle is 15 minutes at speeds between 60-100 kph, and the O2 sensor driving cycle is >40 mph. The evap emissions leak testing and purge flow monitoring cycles start 5 hours after the ignition is switched off, if the engine coolant temperature has dropped below 35 degrees C. I drove 15 minutes one way on the highway, turned around and repeated it, then stopped by the smog testing center. They confirmed the only readiness flag still unset was evap. They suggested I drive 50-60 miles, and it would clear. Instead, I parked my car, confident it would start the evap monitor cycle 5 hours after I turned the key off. The next day, I warmed the car up, driving it enough to add 100 miles since the test failure. The car passed smog testing. Examination of the retest shows cleaner emissions after driving the car a distance at speed. Low speed HC results had been 62, only 2 below the maximum allowable level, but dropped to 39 on the retest. Inactivity or the normal way I drive may be raising my emissions, as my HC levels are 3-15X more than average, CO levels are 1-6X the average, and NO levels are 4-7X more than average. My other concern is that 800 miles of driving never completed the cat drive cycle. Comments?