[Tolerance Sucks Rocks]

Part of the diesel problem, as I understand it, is from fracking, which produces a lighter crude that doesn’t lend itself easily to diesel production. This makes Biden’s refusal to approve new oil leases for more conventional drilling methods even more dangerous.

[laplata]

Very good point.

[Hootowl99]

You're on target in that lighter, sweeter crude oils produce less in the way of fuels. This has not hindered anything and has been the situation for the better part of the last 100 years. The solution is crude oil blending. This is by mixing light sweet with heavy sour to get a feedstock optimized for market conditions.

Mexico via its offshore fields and Venezuela have been the most common, historic imports into the US for blending. Venezuela has been screwed up for a number of decades. PEMEX has been mismanaged and a victim of organized crime that has hindered its productivity and contribution towards Mexico's economic health. Other worldwide sources are tapped to replace Venezuela and Mexico shortfalls.

Refining pros can certainly describe this better and probably more accurately than I if you're out there in FR land.