A quick look at the tachometer shows it's a petrol.

Two reasons why diesels aren't as quick to pick up popularity. One, not a lot of promotion of the benefits, thus not a lot of public knowledge of modern diesel offerings. Two, the refineries' output in the US is biased towards petrol, hence diesel costs more than regular gasoline. Prices can vary by market- in the Southeast diesel is slightly below or on-par with premium fuel.