Let's see:

Bituminous coal? Strange engine!

Let's look at it:

Gasoline has a typical H-C ratio of about 1.7 - 1.8. For Bituminous coal, it is more like 0.8.

So - it gets closer - undiluted CO2 is like 17%. But still, 5% O2 indicates maybe 20% dilution,... Login to read more.