Every dollar counts while planning a summer getaway, especially now that new data from NerdWallet shows travel costs overall are up at least 11% from this time last year. But if you think your rental car is one place to cut costs, think again. A quick trip to Denver for her niece’s graduation, that was the plan for Amy Falkowski and her 77-year-old mother. The rental car was booked and paid for by Falkowski's sister, but when they landed in Denver, she says nothing was where it was supposed to be.