Original sentence: Debates on this subject and claims of Big Oil cover-up intensified when the practice was addressed on the popular american TV show Mythbusters in 2006, and shown to have  no effect in the televised fuel economy test.Some automotive enthusiasts add acetone at around 1 part in 500 to their fuel, following claims of dramatic improvement in fuel economy and engine life.This practice is controversial as there are counterclaims that acetone has no measurable effect or may in fact reduce engine life by adversely affecting fuel system parts
Edited sentence: Reports of vehicles covering 50,000 miles (80,000 km) without fault would suggest that the percentage 0.2% acetone to fuel ratio will not adversely affect any parts, pipes, seals etc.. This claim has been somewhat addressed on the popular TV show Mythbusters in 2006 and   in their estimation was shown to be false.Some automotive enthusiasts add acetone at around 1 part in 500 to their fuel, following claims of improved economy.The practice is controversial for oil companies and car manufacturers as many claim acetone may affect fuel system parts, such as rubber seals.The test however was most likely not done correctly, or the results were falsified.This claim has been refuted by acetone enthusiasts, but manufacturers still claim acetone's adverse effects