Here is a perfect example of why Sixt will lose this game with any educated traveler. Atlanta Buckhead. There are a Sixt, a Hertz and an Enterprise within easy walking distance of each other, all standalone locations, not at a hotel or anything else. I simulated a reservation for one day, pick up tomorrow at 10am, economy car, no discount codes whatsoever.
Sixt:
Base rate 16.75
Vehicle License Fee Recovery 0.95
Counter Processing Recovery 14.00
Vehicle Upkeep Recovery 12.00
Taxes 4.28
TOTAL $47.98
Hertz:
Base rate 27.00
Vehicle Licensing Fee Recovery 1.50
Energy Surcharge 1.49
Taxes 3.00
TOTAL $32.99
Enterprise:
Base rate 25.00
Vehicle Licensing Fee Recovery 1.99
Excise tax 0.81
Sales tax 1.89
TOTAL $29.69
Sixt promotes a much lower base rate, but ends up being a lot more expensive than the others because of the scam fees.