The second one is better than the first. But I still think they used a JG double for the first one. Here's why.
Take a look at the background and one finds city streets in an urban environment, trees and other potential road hazards. Even with police closed roads, the stunts were a tad dangerous due to the landscape. The big factor though was the driver "rules" contract each NASCAR driver must sign along with his sponsor's "good conduct" contract. No way NASCAR would allow street stunt driving by JG in #1.
Looking at #2, notice it is all essentially off-road once JG takes off into what appears to be a series of small airport sheds or county fairground buildings. Once in a very controlled non-public environment, then the real JG could go wild, as he did. JMO.