"tactful" In most peoples minds is everyone (no matter how special they think they or their car is) parking it in ONE spot.
You might think you and your car are special, many more people think your gluttonous parking habits are rude, selfish and shouldn't go unnoted, weather that be commenting directly to you, or damaging your precious car or whatever.
You asked if anyone takes up two parking spaces, the OVERWHELMING consensuses is, taking up two spots is rude, selfish and inappropriate, and that was here in the corvette group. You are free to behave that way, although now you can't do it in ignorance. Nor can you be surprised if some dolt damages your car because of your arrogant behavior.