How many parts per million of gasoline does it take to cause an explosion?
Answer:
The flammable limits of gasoline are between 1.2% in air(Lower limit (LFL)), to 7.1% in air (Higher limit (HFL)).
1.2 per 100 parts = 12,000ppm
7.1 per 100 parts = 71,000ppm.
(These are the minimum and maximum figures at which gasoline will burn in air and is the difference between a 'Lean' mixture and a 'Rich' mixture in the 'Fuel to air Ratio' to the engine...The LFL and HFL figures above, vary slightly with the grade of gasoline).
The lower explosive limit (LEL) of gasoline in air is 1.4% (14,000 ppm) by volume. I'm not sure how you think this relates to fuel economy, as higher concentrations will release more energy and provide more power for a given cylinder size. An engine running at the LEL would be making very inefficient use of its combustion chamber.
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