Having gone on a cross-country road trip in the hybrid, I thought I'd post our count of plug-ins spotted either going down the road or parked in a parking lot (dealer lots/cars for sale not counted).
Day 1 (Pittsburgh to Topeka, Kansas)
1st Gen Volt - 4
2nd Gen Volt - 1
Tesla Model S - 3
Th!nk City - 1
BMW i3- 1
Day 2 (Topeka, Kansas to Alamosa, Colorado)
Chrysler Pacifica Hybrid - 1
Tesla Model S - 1
Day 3 - No sightings
Day 4 (Alamosa, Colorado to Flagstaff, Arizona)
1st Gen Volt - 1
Day 5 (Flagstaff, Arizona to Bakersfield, California)
1st Gen Volt - 1
2nd Gen Volt - 4
Tesla Model S - 3
Tesla Model X - 4
Day 6 (Bakersfield, California through Seqoia to Fresno, California)
1st Gen Volt - 2
2nd Gen Volt - 3
Tesla Model S - 3
Nissan LEAF -3
Ford Focus Electric - 2
(Not that it counts, but I test drove a Bolt in Bakersfield)
Day 7 (Fresno, California through Silicon Valley/San Francisco to Sacramento, California)
1st Gen Volt - 8 (estimate, lost count)
2nd Gen Volt - 15+ (again, estimate)
Tesla Roadster - 1 (Very Orange in San Francisco)
Tesla Model S - 10+
Tesla Model X - 8 (estimate)
Tesla Model 3 RC - 2 (White and Midnight Silver pulling into Tesla HQ, pix in Model 3 thread.)
Spark EV - 1
Kia Soul EV - 2
VW eGolf - 2
I-MiEV - 1 (3 if I count Joe's...I'll leave that up to you guys.)
Chevy Bolt EV - 3
Day 8 (Sacramento, California to Elko, Nevada, didn't keep track too well)
1st Gen Volt - 1-3
Tesla Model S - 2-5
Tesla Model X - 1 (parked, along with two Model S, at the Dentist's office down the road from the Gigafactory)
Day 9 (Elko, Nevada to Laramie, Wyoming, also didn't track well)
1st Gen Volt - 1-3
Tesla Model S - 1-3
Day 10 (Laramie, Wyoming to Lincoln, Nebraska)
Nissan LEAF - 1 (being dolly towed by a U-Haul)
Day 11 (Lincoln, Nebraska to Normal, Illinois)
1st Gen Volt - 1
2nd Gen Volt - 1
I-MiEV - 4
Day 12 (Normal, Illinois to Pittsburgh, PA)
1st Gen Volt - 2
2nd Gen Volt - 1
Cadillac ELR - 1
Model S - 1
I-MiEV - 1
Nissan LEAF - 3 (1 charging at the hotel)
BMW i3 - 1