Higher gas prices keep government officials searching for alternative sources of fuel.

Ethanol continues to be a popular option as an additive to gasoline.

The Wisconsin Bio Industry Alliance says a fuel containing 85 percent ethanol, called E-85, is gaining popularity.

Last month, Wisconsin's E-85 stations sold over 300-hundred-thousand gallons of the fuel.

But that transition to ethanol has options drying up it's leaving some customers high and dry.

As yet another gas station makes a switch, some are putting on the miles seeking out more expensive gas.

For one gas station in Middleton, high prices mean more business.

Bennett's Sinclair Station is one of the very few places left in our area where customers can get a pure blend of gas.

Despite the price, it's an option others wish they still had.

At Monona Tire on Madison's West Side the sales are still coming, even as the options are being torn away and a new apology greets customers looking to fill up at the Shell on University.

Customer Sean Knight says, "I pulled up last week and they had the sign that said this will be our last week"

The last chance to get unblended gas. It's a change station owners across the area don't have much choice about.

Monona Tire General Manager Ted Manning says, "We were forced to do so. We didn't want to do so. We don't think these types of fuels are as good for your car"

A government mandate requires billions of gallons of renewable fuel, mainly ethanol, be added to the gasoline supply year after year. It's forcing suppliers away from unblended gas and leaving many owners with nothing but the ethanol blend to order.

As an independent station, Bennett's in Middleton is one of the few stations left offering unblended gas.

Customer Tom Scheuerell says, "I notice a little better gas mileage, a little better the way it runs, overall i think it's a better gasoline."

Employees say despite a higher price their sales have increased over the last three months as others are left with no choice but buying the blend.

Knight says, "There is a frustration in fact I think they'll be forced too, because I think that everyone will have to have ethanol soon and even these guys will be forced to have ethanol because there won't be any other option."

Employees at both of those gas stations that have made the switch say they have had quite a few complaints from customers.

At Bennett's they don't think a switch is in their immediate future but these customers say if it was, they don't know where they'd go.