This is a bottle of Blue Thunder fuel - America's #1 racing fuel and fuel of choice for more race winners than any other brand in the past decade. The secret is in its unique additive known only as ZX-7 that provides over-lean indication, a feature that can be helpful for those that are new to gas powered cars or want maximum protection for their engines.
When an engine is over-leaned, internal engine temperatures skyrocket enough to cause damage. At these temperatures, Blue Thunder Sport Formula changes from a lubricant to a combustible, indicating that the mixture is too lean. On the track, the car will hesitate during acceleration which signals to the driver that the mixture is too lean. If the engine is left to run with the overly lean mixture, it will shut down before any damage is caused to the internal engine components.