The bill comes at a time of higher food prices that might be caused by the fuel industry's use of corn and soybeans.

For the past eight years, Dale Laird has driven through every state between Canada to Mexico, but the fuel in his Freightliner comes with a steep price tag.

Today's diesel is $1.21 higher than this time last year.

Missouri might mandate biodiesel, but Laird said it's rare to see the mixture of diesel.

Biodisel is a nontoxic, biodegradable fuel created from renewable resources, most commonly soybeans, and is mixed with petroleum-based diesel oil.

Some truckers know the bio-blend will run their trucks just as well as regular diesel, with a smaller impact on the environment.

"It's going to make the air cleaner," said Randy Potterfield, a truck driver.  "I see more pros than I do cons for it. So i'm all for it."

Some, however, think a mandatory bio-blend isn't fair to impose on diesel users.

"This particular approach, we feel is a step in the wrong direction," said Bruce Heine of Magellan Midstream partners.  "There is a provision that says if the cost of biodiesel is lower than the cost of diesel, the requirement is on, if the price is higher, it's off."

An average 18-wheeler has two 100 gallon fuel tanks. It averages about four to seven miles per gallon, and can run about 1,000 miles on one fill-up of diesel.

Whether its petroleum-based diesel or bio-diesel, truck drivers will continue to feel the pain at the pump. 

Missouri has ten plants capable of producing B-5, the biodiesel with five percent biofuel -- enough to provide the amount of fuel needed to fuel the B-5 diesel fuel.