On an older “real classic” (yeah yeah yeah, no comments from the peanut gallery lol) that has a gear and cable driven analog speedometer, that is easy enough to get around, change the speedo gear or just unhook it all together for when those extra miles are needed… 
I use a GPS app on my phone and put my phone against the instrument cluster (snug fit) to show me my speed, but I have to be careful as the car can accelerate faster then the GPS can keep up with for the app I use anyway…
The year, 2035, the Indianapolis 500 is now all electric… Imagine those pit stops,
“Can I get you a Cappuccino with that Vanilla Bean Scone while your car is charging?”
“Oh, they changed your tires 5-minutes ago… You still have 7-minutes for the car to charge.”
“Oh, don’t worry about your position, Marco Andretti III (Mario’s Great grandson…) is three-seconds back, but he went for a shower while his car is charging…”
Basically they trust you. However, if you do drive the vehicle during the time period you told your insurance company it’s in storage, and get in an accident - then you WON’T BE COVERED.