Nice stats you have there!!! I find fumbling around with the cheap prices mid day and charging the car with the sun means that nearly all of our solar we use ourselves. This 5 year investment with the car use and no gas costs will make it go much faster than that.
Are you considering one of those home batteries? They seem a bit much to me at the moment honestly
We could charge the car on sunny days if you limit what current it takes. I think it works out cheaper than burning oil anyway.
We have the battery and it makes a big difference as we can use the cheaper power.