just used the promo @ Orange County, CA (SNA)
reserved @ $16.79/day (Mazda 6)
original estimate for 3 days was ~$62.
Estimate on pickup receipt was ~$77 ($20.99/day + tax on ~$70 gas)
Final Receipt after 3 days was ~$83 to my credit card.
Called Hertz billing 2 days later, the nice lady refunded ~$22 to get to my original estimate @ $62.
Very quick, i was ready for a fight, but didn't need the brass knuckles after all..