[EternalVigilance]

I must admit I’ve never heard the term “a barrel of gasoline” before.

[nascarnation]

In oilman terms, a barrel is 42 gallons.

(as opposed to the classic 55 gallon drum used for chemicals)

[thackney]

In most of the US petroleum industry, all the refined products are measured in barrels. It is only pricing that typical goes to the gallon for gasoline.

http://www.eia.gov/dnav/pet/pet_move_wkly_dc_NUS-Z00_mbblpd_w.htm

http://www.eia.gov/dnav/pet/pet_pnp_wprodrb_dcu_nus_w.htm

http://www.eia.gov/dnav/pet/pet_stoc_wstk_dcu_nus_w.htm

[reg45]

In this case, the barrel is just a unit of volume. A barrel of crude may contain more than one barrel of refined gasoline because it is more dense.