Can't offer any personal experience, but am expecting a 2015 F250 4x4 in next few weeks to come in. I ordered it with the dual fuel option (6.2 gasoline / CNG). I put together a 5 year anticipated cost summary comparing straight gas, diesel and the CNG option and the CNG wins as long as the fuel stays under $2.75. It's now anywhere from $1.69 to $1.99 here in Lafayette. I will keep you posted once I actually receive it.
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