[Argus]

The price for a liter of diesel fuel was 99.9 pounds. If we did the math right, this is equivalent to about $6.50 per gallon.

If that's your math the price would be over 350 pounds per gallon so something's off.

[Old North State]

I think the author meant to say 99.9p(pence)per liter, or about 1 pound sterling.