I've wondered about this myself, but I've never really done any research on it.
As you know, Domain, some of our NFTA busses run on CNG. I always wondered if the engine was a converted diesel or gasoline engine (my guess is that it's a converted diesel, since the fuel delivery system is already designed for high-pressure fuel injection). They sound like diesels, at least when I've been close enough to hear one.
2016 Ford Escape Titanium 4WD
, Magnetic Metallic, Charcoal Heated Leather, new 9/23/2015
- 2.0L EcoBoost I4, 6-speed auto, 301A, Sync 3/Sirius/HD, Panoramic Roof, Navigation
- Husky WeatherBeater 99741/23741 mats, Ford factory splash guards2008 Ford Fusion SE FWD
, Black, Charcoal/Red leather, new 2/23/2008, still strong and trouble-free
- 2.3L I4, 5-speed auto, Sync, Sport Appearance/Moon 'N Tune/Ambient Lighting packages, Husky WB 98301 mats2013 Ford Escape Titanium 4WD, Ruby Red Metallic, Charcoal Leather, new 11/2/2012, sold 9/23/20152010 Ford Escape Limited FWD, Black, Camel Leather, new 4/22/2010, sold 11/2/20122007 Ford Edge SEL Plus AWD, Blazing Copper Metallic, Charcoal Leather, new 6/18/2007, sold 4/22/20102005 Ford Escape Limited 4WD, Redfire Metallic, Pebble Leather, new 6/4/2004, sold 6/18/2007