4. Analysis of key features

The characteristics calculated from the chromatography of a natural gas fairly representative of an "H"-type gas, are compared with those of an SP95-type gasoline typically distributed in European service stations (table 2 ). Taking into account the characteristics of a "B" type gas, instead of an "H" type gas, would not alter the trends revealed by this comparison with a gasoline.

While there are significant differences between natural gas and commercial gasoline, it's important to point out that natural gas can be used on a "spark-ignition" engine basis, and that adapting the injection system (from tank to injectors) may be the only essential change. To exploit the full potential of natural gas, more far-reaching adaptations are required (compression ratio, timing, ignition system, maps, after-treatment...