Someone asked for the relative energies of natural gas compared to
Gasoline. What I've been able to gather is :
1 cu/ft NG=1028 BTU
1 gal Gasoline=125000 BTU
C. Smith

Those are "sit and burn" BTUs.

In actuality, the efficiency of gasoline as a motor fuel is very low,
while the efficiency of natural gas is very high.  Otherwise, a NG or
propane-fueled car would have pretty much no range or power.  There are
gas-powered Crown Vics in service as police cruisers!

Gasoline must be stable as a liquid, then rapidly broken down and
vaporized before it will burn, so most of a gallon of gas provides no
power.  Natural gas must simply be heated, and a far higher percentage
burns.

Keith W

Well there is still the high BTU per cubic foot of gasoline.
The tank needed for NG is also big and heavy.

Paul Lamar

Oh, sure, but it's not as one-sided a question as it first appears.

The optimum fuel is hydrogen.  Someday we will be able to pump water
into the tanks and break it into fuel for the Tesla turbine engine and
oxygen to breathe.  The only thing that will derail that would be
development of the optimum electric power / motor system.  Either way,
we win.

Until then, we have to make tradeoffs, and they're not always as they
would appear to be at first glance.  The NG / Gasoline numbers are like
that.

Keith W

There is another problem with gas based fuels and that is low VE.
You cannot  get as much air in the engine using gaseous fuels consequently
the power is down. High pressure direct injection is a way around that.

Paul Lamar