Originally Posted by
RatherBeFlying
If cryogenic methane reemerges as an auto fuel (some may remember automotive outlets 20-so years ago), the SUVs might shrink that interval to 30 years
I've never heard of cryogenic methane, except for bulk transport.
Aren't you thinking of LPG (liquified petroleum gas), which is not cryogenic, but stored under pressure to keep it liquid, hence needs a pressure tank in the back of the car.
Still exists, certainly here in Europe, just not as widespread as petrol (gasoline) or diesel, hence fewer distribution points.
CJ
Correction (just looked it up): LPG is a mix of propane and butane, not methane, my mistaek.
Compressed Natural Gas (CNG) is basically methane, but requires big pressurized tanks (200 bar, 3000 psi typical). Here in France I see it more and more being used for buses, but not for cars, in the absence of a country-wide distribution network.