My family and I are planning to drive down to the In-laws in Florida from NJ next week and I was wondering what sort of maintenance I should do prior to the drive down. I have a little over 42k miles on the car now. I just got the oil changed 2 weeks ago and replaced the cabin air filter last week (did it myself). At the last oil change, the service guy said I should get my transmission fluid changed and the fuel injectors cleaned. He quoted me around $300 to get these 2 things done. Question is....should I pay $300 to get this done? Should getting some fuel injector cleaner from autozone be enough? What about the transmission fluid? I did some research on my own but it's hard to get solid advice. I've read too many conflicting stories on car maintenance that it's hard to know who to believe.