11. The heart of the Mitsubishi's MVV system is the linear air fuel ratio exhaust gas oxygen sensor. 12. When catalytic converters were first introduced, most vehicles used carburetors that provided a relatively rich air-fuel ratio . 13. This stratified-charge approach to lean-burn combustion means that the air fuel ratio isn't equal throughout the cylinder. 14. This allows ignitable liquids to ignite easily, and when mixed in a proper air-fuel ratio , readily explode. 15. In this version the most common problem is the air / fuel ratio solenoid in the carburetor. 16. The material balance directly relates the air / fuel ratio to the percentage of in the combustion gas. 17. This results in a greater payload to fuel ratio which reduces the cost per unit mass to orbit. 18. The oxidizer could be throttled with one valve, and a high oxidizer to fuel ratio helped simplify combustion. 19. Three-way catalytic converters can store oxygen from the exhaust gas stream, usually when the air fuel ratio goes lean. 20. The stoichiometric air / fuel ratio of dimethylfuran is 10.72, compared to ethanol at 8.95 and gasoline at 14.56.