I've been looking for how much energy is in 1 liter of bio- (or natural) gas, so I can work out how far 1 can drive with a 3 gallon (=11,35 l) tank (natural or biogas compressed herein to 250 bar).
These sources have some useful info:
deepresource
ct.gov
Anyway, here are some of my calculations, let me know if they're correct (I'm not sure, since the difference with hydrogen is HUGE. In comparison, hydrogen has 0,003 kwh/l whereas natural or biogas has 5,42 kwh per liter, so 1806x more)
1 cu foot of natural gas = 0,012 gallons natural gas @14,73 psi (=1,0155 bar) = 0,045424941 liter natural gas @14,73 psi (=1,0155 bar)
1 cubic metre of natural gas = 8,8 kwh
0,0283168 cubic metre = 1 cubic foot
1 cubic metre = 35,31472 cubic foot
8,8 kwh / 35,1472 = 0,25037 kwh per cubic foot
1 cu foot of natural gas = 0,012 gallons natural gas @14,73 psi, so 0,25037 kwh is in 0,012 gallons natural gas @14,73 psi or 0,25037 kwh is in 0,045424941 liter natural gas @14,73 psi
0,25037 kwh X 22,0143 = 5,51 kwh is in 1 liter of natural gas @1,0155 bar
5,42 kwh is in 1 liter of natural gas @ 1 bar
135,64 kwh is in 11,35 liter of natural gas @250 bar