Why bother with gas, use NAPALM!!!
I believe we got rid of that. Too inhumane you understand. However, FAE's are OK? Well I guess I just don't understand the nuances of a fiery death. Besides in this case you want the stuff to flow, not to stick, which is what Nape tends to do. Natural gas also flows to the low spots. We had a nasty section explosion and fire in Texas a few years back. A NG pipeline broke and the stuff filled all the low places, until some dufuss drove a car through one of them, then BOOM! a good chuck of countryside went up. Fortunately it was not a contained explosion, but probably was somewhat similar to an FAE on a larger scale.