It's cheaper than a lot of brand new motorcycles and it's plated. I just bought a Sur Ron Light Bee and it cost's around $4k this one is $2.5k and it's easy to put a plate on it, everything is DOT approved.
I guess if you will regularly be riding more than say 15 miles it's probably not a good bike for you. Also if your trying to save gas over a Grom the Grom get's like 100 MPG? Still cheaper than a Grom. A Grom has what 10HP? It's probably only a little bit faster than this bike plus you get torque all the time no gears to shift. It's got a reverse mode. I guess it dependent on how you will be riding it. I saw one on CL couple months ago when I was looking for my Sur Ron.
It'd probably easy to throw that into a van I bet, you can lay it down and not have to worry about spilling fuel or oil everywhere.
I've never ridden one before though so I can't comment on it's riding experience =/
Maybe look into a used Zero bike. You can probably find one for around $5k maybe.
Then yeah there's the Sur Ron Light Bee at around $4k. But it's not plated but you can put a Moped plate on it and I found out a Moped plate is really handy you can ride in the bike lane "safely" and cut through traffic =P Or you can ride it like an Ebike and not have to pay insurance for it and stay in the bike lane. Here's the thread I started on the Light Bee if you want to look in to it:
https://www.bayarearidersforum.com/forums/showthread.php?t=534684