"Private Investigators and Trainees are paying $2.80 cents a gallon as of April 20, 2011 in southern border states"
That's right. Just across any of the border towns in Mexico they can pay $2.80 a gallon for either unleaded or diesel. That's $1.00 OFF the pump price in the USA.
Otherwise, private investigators who incorporate themselves through the International Private Investigators Union can set up a corporate Visa Check Card to be used at any gasoline station in the USA. The end of the year average cost can range from 76 cents OFF the pump price (or $2.74 gallon) to as much as $1.90 OFF the pump price (or $1.75 gallon) because of the method the VISA is set up to save taxes.
How much is a gallon of gasoline costing you today?