At the Porto airport, a Sixt rental agent was trying to upsell us a Mercedes-Benz. It’s only 42€/day she claimed – 18€ more than the Smart car we booked off Expedia – and it would come in handy when you drive those mountain roads. She almost had us, that is, until we reviewed the total amount and realized that, contrary to our understanding, the daily rate had now jumped to 66€ (almost tripled the amount we had initially signed up for) and we were going to be driving for 9 days. We politely declined her offer and kept our Smart.
Travel-Gourmand.com 