Some works of fiction like to pretend gas and fuel behave like high-explosives when shot/hit to exemplify.
Since it's a common trope in videogames and the like I figure it'd be good to calculate what the typical destruction of such tanks would yield.
Also this is just a general calc, for larger tanks such as the ones depicted in the example it's preferrable to do a specific calc of it.
Note: Given feedback, this only applies to characters who can destroy empty gas containers.
Destruction of fuel tanks[]
Fuel tanks are made of steel so we´ll use 208 j/cc for fragmentation, V.frag for steel is 568.5 j/cc (typically this is the most common portrayal) and 655j/cc for pulverization on average, if there is nothing left of the tank after the explosion, go for this. Values gotten from here
We need the total volume of the steel for each tank, for that we'll use the pic on the right as reference, we'll use the weight, convert to grams and divide by the 7.9 g/cm3 density of steel to find the total volume.
Should be noted that though the tanks are labelled as 20lbs, 100lbs etc only the tare weight is the actual weight of the steel.
We'll use a 20lbs , a 100lbs, and a 420lbs tank, linked pics are for reference to their size.
Volume 20lb: Tare Weight = 18 lbs or 8164.663/7.9 = 1033.50164556962cc
Volume 100lb: Tare Weight = 70 lbs or 31751.47/7.9 =4019.17341772152cc
Volume 420lb: Tare Weight = 278 lbs or 126098.7/7.9 =15961.86075949367cc
20lb tank
Fragmentation= 214,968.34 joules
V.Fragmentation= 587,545.68 joules
Pulverization= 676,943.57 joules
100lb tank
Fragmentation= 835,988.07 joules
V.Fragmentation= 2,284,900.08 joules
Pulverization= 2,632,558.58 joules
420lb tank
Fragmentation= 3,320,067.03 joules
V.Fragmentation= 9,074,317.84177215 joules
Pulverization= 10,455,018.79 joules
All of the values are Wall level, with the last one(frustratingly) a few grams off Wall level+
Should be noted that you should only apply the full value of each explosion for durability if the character is caught at point blank range, if the character is a considerable distance away from the blast one should use the method outlined in the Explosion Yield Calculations page.