The Sabatier process yields methane, the lightest member of the alkane series. Methane also has the best gravimetric energy density of the alkanes. But for ease

The Sabatier process yields methane, the lightest member of the alkane series. Methane also has the best gravimetric energy density of the alkanes. But for ease of handling, heavier alkanes that liquefy at above-cryogenic temperatures are better.