American Power Group (APG) provides a patented, software driven conversion technology for existing vehicular and stationary diesel engines which allows an engine the flexibility to run concurrently on diesel and CNG or LNG; diesel and well-head/pipeline gas, diesel and bio-methane or 100% diesel. APG's solution is non-invasive, requires no engine modifications and allows operators to lower operating costs by displacing 40% to 65% of normal diesel consumption with cleaner burning, cheaper natural gas.