Is it possible to create a data point based on the sum of search terms?
Something like a single line for ("Chevrolet Volt" OR "Chevy Volt" OR "GM Volt") would be more accurate as neither Ford nor Nissan have multiple common names likely to turn up in search terms.
Nope...see my comments in the first post about the OR.
Unfortunately, these metrics are vulnerable to hype and tampering, so I put little value in them. I've watched internet activists and hacktivists swarm movies, music, videos, products, etc. before, just to create buzz and force a bump in traffic, just to attempt to claim an early victory. Sometimes it even works, but autos are just too important an item to be influenced by such hype. It may generate initial sales, but sales will fall off a cliff if the vehicle does not serve the driver's lifestyle / utility.