Yesterday, I filled up at the gas station, and I was shocked. Shocked! Cost to fill up? $64.12. I really haven’t been hiding under a rock. It’s just that I don’t often fill the one vehicle I share with my husband, so it wasn’t until I handed over $64.12 that the runaway cost of gasoline got personal. Have you noticed? Gas prices jumped more than 9 percent in the past month and 22.5 percent above last year at this time, and they’re not expected to slow down anytime soon. Believe me, as I pulled away, I renewed my resolve to employ every gasoline-conservation technique and tip known to humankind. I thought perhaps you could use a reminder as well. Combine Errands Instead of running to the dry cleaners tonight, the drugstore tomorrow, the post office the next day, and the doctor next Tuesday, combine those errands into one trip. Plan …