Position yourself strategically, so when the wx cooperates, you can take full advantage of it;
~focus on equipment speed , effectiveness and "up-time "( through maintenance, troubleshooting and spare parts inventory)
~ keeping things working and as tidy as possible. from
changers to tree vendors, keep it all as functional as you can.
~differentiate your wash by offering more products and services at each customer visit: I have tri foam and air blow dry in SS bays. DIY towel dry station and DIY auto bay prep bucket / brush. Tire air machine. 4 single column vendors, one 5 selection little trees machine, one electronic 3 column machine and an AMS Visi-combo machine I got from Uncle Sam. There's always more you can add, too: soda machine, etc.
~ keeping price high. Someone else said that if you are better than your competition, your price should be higher than theirs.