The plans show a "3000 sq ft Convenience Store". They hope you will buy an armload of Twinkies and Licorice ropes. At Convenience Store prices. And you get to visit with truck drivers. You may also get to watch how hydrogen at 10,000 psi is pumped into a Toyota, if the multi-fuel center will allow super explosive hydrogen anywhere near their complex. I don't expect Toyota will allow just anybody to pump hydrogen. Even if they make it idiot proof, the world seems to make better idiots.
Actually, there may be a few truck drivers wanting to come over and see what a Tesla is. Some of those trucks take a while to fill, some with two 300 gallon tanks. Even with twin 75s, they won't be filling up in 5 minutes. Or with one 50. That's some serious money, and when you tell them that Superchargers are free forever, you will truly tug at their wallet's heartstrings.
The plans show an outside picnic area with tables. It's Napa, so even a convenience store will have some gourmet food items. After all, our drive in burger place has a wine list.