Must have been the light blue Tesla parked in my parking lot that had me forgetting about gasoline. :)
I don't have a Tesla sitting in my driveway, but have only purchased 10.1 gallons of gasoline in the past two years since I bought a diesel pickup. :-)
If you still want to tow out to Lincoln, how much cheaper would the rental/mileage be if you rented a small RV and towed your car behind it? A couple of overnight stops at the Wal-Mart campgrounds along the way might make up for the extra fuel costs in hotel savings.
Of course, I have to add an obligatory warning about trailering your car to an event. I made the mistake of renting an open U-Haul trailer for the Seneca Tour last year, because the submarine had not been driven in almost two years and I didn't want to stress the car on a road trip just like your wife's rationale. At the end of the weekend, it took longer for us to take the magnetics off than it did to load up the car onto the trailer to head home. This was the first time that I ever left an event without having to change back to street tires, and it felt good to hit the road without that task at the end of a long weekend. I call it a mistake because it led to the purchase of a 24' aluminum enclosed trailer, which now fills up 3/4 of our driveway and still has a $1,500 to-do list before it is fully outfitted for weekends in the paddock. Don't say that nobody warned you..... :-)