Now thats funny, I can picture it in my mind. A salesman dressed in a black suit from a giant oil company knocking at Silverado Gold Mining door with his sales pitch....

"The oil company is prepared to let you try our oil products for free for the first 90 days. If you like our product after the 90 day trial, every gallon you buy, we will give you two free gallons. And we will check the air pressure in the mining equipment tires for free."..... LOL