Gatorade G is the basic Gatorade formula that has been fueling the athletes of the world for decades... Similar to way that gas and oil in your car have been powering cars for decades... only without the gross toxic qualities of oil and gas.
"GatoradeĀ G is the rebranded name for the original type of Gatorade. This type of Gatorade features classic flavors such as lemon lime, grape and fruit punch. This type of Gatorade has sodium and potassium to help the body replenish lost fluids."
Like we said; the equivalent of gas and oil for cars.
Fact courtesy of: http://www.ehow.com/facts_5459020_types-gatorade.html