Greg99,

No fair telling people about my level 1 trick!

Also, the first day charge for parking at SFO is $22, then it goes up to $35. And my preferred long term parking lot is PCA. They are much faster to use than the public long term parking lot (though Park&Fly and the other private firms probably offer similar service to PCA - it is just easy to get $9 discount coupons for PCA and after 31 parking days you get another 5 free).