I agree when marketing to your own customer base, you can immediately tell if it works or not. We track every piece of marketing. If it breaks even or better, we keep doing it. For new customers, we buy a list of new movers in our area, then cleanse it against our regular data base. We send a 1st letter with a magnet. Two weeks later our 2nd letter goes out and then 2 weeks later our 3rd letter goes out. You must create urgency. With our 2nd letter, we also send a coupon page with12 coupons with a little longer expiration date. They must bring in the letter to claim their service. We can then track how many came in each month and how much they spent. We have been doing the same letter with different inserts for about 7 years. Very few come in on the 1st letter, more on the 2nd letter and most come in on the 3rd letter and sometimes we send a newsletter for the 4th. You have to track your numbers to see if it works.
If we should have a slow day starting out, we shoot an e-mail for that day a low ball offer oil change and immediately fill up the bays. You can control how long it will run or like we do just 1 day, the next day a little more and then something for the next 10 days. You control the schedule.