No, on the contrary. Typically the station selling at the lowest price will cause the other stations to reduce their prices in order to stay competitive. Many dispensers are designed to start with a very low-pressure flow. After a second or two, product flow and hose pressures are increased. We check thousands of these pumps annually, and yes, you do get that nickel or dimes worth of gas.
Tare indicates the actual weight of the package, box, or container.
Net, which generally appears on all packaged commodities, indicates the actual weight of the product being purchased. My cans weighed 50 pounds according to their scale, but they reduced my total weight by 10 pounds because my cans were dirty and wet.