...yes, it is very expensive to install ,about 2 years to recover cost at $3.50 a gallon...
From the website provided, it looks like there are a number of places to get CNG in PA; one really close by my home too! But there are huge swaths of the east that are blank (entire states...suggesting nanny stateism at it's worst). So it has to be worth it as I'll still be using gas.
I also have to debate losing access to the forward wall of my bed is worth it. Kinda defeats the purpose of getting the gas hog in the first place as carrying large items is safe only by strapping them to the forward wall.