Unleaded
Saw the word and thought I must be missing some neurons... I clearly remember Leaded fuel being phased out in the early 90's. Where could one still get leaded fuel
I didn't even bother to lookup LRP (Lead Replacement Petrol)...
Stumbled upon interesting finds on Leaded fuel, the early days..

"Ethyl" brand leaded gasoline -- tetra-ethyl lead -- loony gas -- one of the world's greatest environmental disasters. Many thousands died, and whole nations were poisoned. General Motors, Standard Oil and the Ethyl Corp. claimed there were no alternatives and that it was just the "price of progress." But there were alternatives.

"Ethyl" brand leaded gasoline versus ethyl alcohol -- which was the best anti-knock additive for gasoline? Three grams of tetra ethyl lead and 15 percent ethyl alcohol both improved a fuel's power. One was cheap, but it was a well known poison. The other was a clean, renewable fuel that helped farmers and kept nations independent of political oil pressures. Dozens of countries were already using ethyl alcohol fuels.
Just after World War I, American engineers made their choice. Putting profit above public health was nothing new for American industry, but it had never been done on such a massive scale and with such deadly results...
http://www.radford.edu/~wkovarik/ethylwar/
Wuka fungao ..