Now that diesel (£1.32 per litre in the UK) is so much more expensive than petrol (£1.18 per litre) is it more economical to use straight unleaded petrol in a steamer instead of 50/50?

Both fuels have similar Btu per unit weight but the greater density of diesel gives it more oomph per litre than petrol. At a certain point the price difference must wipe this out. Are we there yet? I appreciate that vaporiser length and perhaps jet size might have to be changed. Is there any other reason to prefer the mix of diesel/petrol to straight petrol?

We have a government which prefers to finance the country by taxation on fuel and as diesel vehicles become more economical (40mpUKgallon is about the average for the newest 3 litre cars) we must assume that the tax must go up to maintain revenue as less fuel is used.

It is probably easier to change a vaporiser than a government.

Mike