>It's interesting that diesel is taxed more than gas in the US. It's the other way around in France.

Although in the US there is commonly an "on-road"/"off-road" split, at least in more rural/agricultural regions or states like mine. The diesel is dyed so it can be distinguished if inspected, and the off-road diesel is either not taxed at all or taxed at a much lower rate. The intention is to not tax agricultural usage, and also that it doesn't make sense anyway to tax tractors and other equipment (almost all using diesel still) used in fields and woods for road maintenance. In contrast, the biggest on-road use of diesel in the US is commercial trucking of various flavors, and those really do do much more damage to roads (and if anything aren't taxed proportionally at all). One of the very rare times the politics and costs have even mildly aligned.

It'd be nice if we could have more electrification in off road agricultural equipment as well but even putting aside all issues of energy density (which are solvable via quick swap packs/trailors if nothing else, and that's much easier to engineer in a tractor form factor and much easier to have a setup for at a typical farm) the weight will be a challenge, soil compaction is a very serious concern for most ag. Maybe electrification along with extra R&D/gov support can drive down the cost and improve the reliability of continuous track (or split continuous) for ag applications. John Deer has developed a few models with it, but the majority up and down the spectrum use tires. Combining the two though could allow for electrification with the same (or actually lower) ground pressure.

Diesel for agricultural use is subsidised almost everywhere in the west to some degree.

France removed taxes on non-road diesel this year and paid per-liter-subsidies on top.

Keeping independent local agriculture is quite existential for any state, so this is understandable despite being morally questionable in my opinion.