So, here is a new thing I discovered on my CC.
This weekend I took my first longer trip in my new CC - from Long Island to Baltimore, and back. I do this trip about once every five weeks, visiting family.
I always follow the same route, and I know that the trip is about 450 miles, round trip - door to door.
Yesterday, when I arrived home, my odometer showed 475 miles. That's about 5% more. Interestingly, the speedometer, when compared with my Garmin GPS, shows about 5% faster speeds, too. That would explain the "extra" mileage on the odometer (If the speedometer says you are traveling at 80 mph, for one hour, then the odometer will show 80 miles traveled for that hour. But if your ACTUAL distance travelled is only 75 miles, then you incurr a 5 mile "penalty" on the odometer) While this may seem insignificant, it will create some problems if you are leasing the car, like me. I have 36K miles for the 3 year lease. If my odometer is fast, at the end of the lease I will have incurred 1,800 extra miles (5%). At $0.25 per each additional mile (over 36K), that's a penalty of $450.00!!!