This threatening letter stated that acting as a supplier and receiver without a license is a Class 3 felony. This class of felonies carries a penalty of up to five years in prison.

On the department of revenue's Web site, David Wetzel discovered that the definition of special fuel supplier includes someone who operates a plant with an "active bulk storage capacity of not less than 30,000 gallons." Wetzel also did not fit the definition of a receiver, described as a person who produces, distributes or transports fuel into the state. So Wetzel withdrew his application to become a supplier and receiver.

Mike Klemens, spokesman for the department of revenue, explained that Wetzel has to register as a supplier because the law states that is the only way he can pay motor fuel tax.

But what if he is not, in fact, a supplier? Then would he instead be exempt from paying the tax?

"We are in the process of creating a way to simplify the registration process and self-assess the tax," Klemens said, adding that a rule change may be in place by spring.

David Wetzel wonders why hybrid cars, which rely on electricity and gasoline, are not taxed for the portion of travel when they are running on electrical power. He said he wants to be treated equally by the law.