According to someone I know in the industry, the EPA estimates for methane leaking in to the atmosphere are greatly exaggerated.
FYI, one of the leading cause of methane "leaks" in the field are pneumatic-type controls use that work using the pressurized gas in the pipe instead of compressed air (more economical to use what is at hand, rather than build out electrical or compressed air infrastructure to power the controls). These types of controls necessarily bleed off pressure in order to work (or they'd be one-way controls that could open, but not close, or vice-versa) The EPA requires reporting based on their estimates of leakages from types of equipment, valves, piping, etc. When his company did an internal audit of losses, they found that they were losing a small fraction of the methane that the EPA forms required them to report. I'm not saying that the actual leakage is an insignificant contribution to warming, nor that the gas company got it exactly right, just that the EPA estimate of possible savings is likely over-estimated.
Probably at least as significant as methane entering the atmosphere from production facilities, is the methane that leaks from municipal distribution networks and consumer end uses.