5 cars?? I've been driving since 1962 and average about 40K a year. For my 2 M miles, as best I remember, we have gone through 25 cars. Highest mileage cars are a 1960 Ford (160K), 1990 Caddy (155000 and still going). 1988 Olds 88 (152K) and a 2005 Dodge Stratus (136K and still going). About 1/2 the cars went over 100K, so you can see I get car fever frequently.
I don't average 55 on the hwy either :') I love to drive to new places and absolutely despise retracing my trips.