@Foxfyre,
One difference might be the language (your 'gas' is 'petrol' here as you know).
The main reason for the difference, in my opinion, is that the low carbon:hydrogen ratio with natural gas AND the lower price just leads people and especially energy companies (and the EU) focus here more on the "environmental friendliness" than on the fossil origin.
(EXXON and EON recently run adverts pointing at the environmental friendliness of natural gas opposed to oil in various European countries.)
From the environmental standpoint, I think that fuel oil versus natural gas is a lose-lose proposition.