Colorado has so far spent $8 million in taxpayer money on nearly 240 compressed natural gas vehicles, with dozens of them stationed in places where there is no compressed natural gas filling stations, has learned.

And the state expects to buy more CNG vehicles, costing $7,000 to $11,000 more than comparable gasoline-fueled vehicles, in the 2015 fiscal year. Many of them are destined for state facilities that also have no current CNG filling station nearby, state records show.

Because of the lack of fueling stations, state workers apparently continue to run many of the vehicles on more expensive gasoline, negating any of the environmental benefits and cost savings touted by supporters of the more expensive vehicles, memos and emails obtained by show.