We routinely do 4-8k road trips in our pets, the FiST (FiFi) or Mustang GT (Rumblemobile in loud Sports mode since new) almost every summer. Different cars and both road stars. I have done all 48 contiguous states and most several times. Over 9k miles last year in the GT, East TN to Key West, FL then to AZ then back to E. TN and it again proved to be a wonderful true Grand Touring car. We have done the same basic trip in the FiST and enjoyed it greatly also. I never feel the FiST is a small car until I see it parked, LOL! I encourage every person that loves driving to see our country, get the hell off the interstates and actually see our country, it is a wonderful place with great people.
As to prep get the car ready with fresh oil and filter, check all fluids, windshield wipers, hoses, belts and tires/pressure. Insure your brakes are in excellent condition especially if like us you take side road routes, rough roads sometimes and tight curves with steep inclines and declines can test a poorly prepped car. You actually get to drive your cars and use your passing skills on the small 2-lane roads with our wonderful Mountune MP-215 boost or the GT's massive Coyote 460 hp we enjoy the drives. Driving creates a time machine for this pair of oldies at 72 and the gazillion watt B&O stereo in the GT or even our lowly Sony system in the FiST blasts 60's and 70's rock as we feel 16 again and act like it! Retirement is the greatest job we have ever had, I recommend it highly. BTW, the FiST averages mid 30's mpg and the Mustang 27 mpg on road trips both driven hard like 100+ mph all the way across N. Dakota in the FiST, she felt tight and hunkered down. Was funny getting passed by pick em up trucks at over 100 mph!
FYI, take a gallon of good windshield wiper fluid for the millions of bugs you will murder on your windshield, water will not work well...........
FiST on!