The phone company literally spends tens of millions on gasoline every year. Just think what would happen to the bottom line if they integrated Nat Gas in the mix over a few years. We usually ditched a truck after 10 years or 100-150k miles. In five or 6 years we could replace every vehicle that used a fuel for way less than $2 a gallon equivalent.
Another plus is nat gas fueled engines run cleaner and last longer.