I'm not sure how to convert or correctly compare gasoline/alcohol to batteries in terms of weight and volume. For example in the following link Specific Energy and Energy Density of Fuels I can find the following information:
Specific Energy
$$E_{8} = \frac{E}{m}$$
Energy Density
$$E_{d} = \frac{E}{V} $$
Specific Energy
Fuel Density Energy Density
kg/m3 MJ/kg MJ/m3
Gasoline 716 -47.3 -33,867
Ethanol 784 -29.7 -23,278
And the information I've found on Li-ion batery from What's the Best Battery:
Li-ion - Gravimetric Energy Density (\$\frac{Wh}{kg}\$): 110-160
I have no idea how to compare/convert \$\frac{wh}{kg}\$ from/to \$\frac{kg}{m3}\$ nor \$\frac{MJ}{kg}\$.
(Most likely it's more complicated then even this, as a combustion engine isn't that efficient in changing potential energy into kinetic energy. I'm not concerned with that at the moment, just trying to figure from a storage point of view how to compare these energy sources).