Mackie Diesel
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Once the oil has been used to bubble your Freedom Fries to a tasty state of crispiness, it'll be combined with rapeseed oil to power McDonald's 155 lorries, saving some 1,650 tons of carbon each year.
All very impressive, but what's happened to the to-hell-with-ya, free-livin' McDonald's of old? Next thing they'll be offering salads with your Big Mac.