The rear-wheel-drive C15 model gets a combined 19 mpg (16 mpg city, 23 mpg highway), and the four-wheel-drive K15 model comes in at 18 mpg combined (16 mpg city, 22 mpg combined). Those ratings are achieved by the redesigned 5.3-liter V-8 engine paired with a six-speed automatic.
The map on the right shows that lightning is not distributed evenly around the planet. About 70% of lightning occurs on land in the Tropics, where the majority of thunderstorms occur. The north and south poles and the areas over the oceans have the fewest lightning strikes.
Cloud to Ground: Lightning that occurs between the. cloud and the ground. Cloud to Air: Lightning that occurs when the air around. a positively charged cloud top reaches out to the. negatively charged air around it. Bolt from the blue: A positive lightning bolt which. originates within the updraft of the storm, typically.