11. This is due to the poor combustion efficiency of the combustion devices and the elevated nature of the emissions. 12. The major advantages of using an RDE in aerospace applications are increased combustion efficiency and an increased operating range. 13. Precisely timed, the cooled air increases combustion efficiency and causes engine exhaust to contain less air pollution, both patents claim. 14. The " 4N13 " 1.8-liter engine uses a compressor with variable vanes in the diffuser passage, further improving combustion efficiency. 15. High-efficiency wood pellet stoves and boilers have been developed in recent years, typically offering combustion efficiencies of over 85 %. 16. Shortages of an additive, methyl tertiary butyl ether, that improves the combustion efficiency and oxygen content of gasoline, also lifted prices. 17. In April 2008, Reaction Design introduced CHEMKIN-PRO for modeling and anlayzing combustion efficiency in gasoline, diesel and emerging alternative fuel engines. 18. The other team ( ARRC / NCTU ) incorporated innovative mixing enhancement devices to push the overall combustion efficiency towards the theoretical value. 19. The TKEnergizer TM works well with methane, ethane, propane, butane and several other fuel gases, with combustion efficiency of CE = 99.9 %. 20. TBN can also be a particularly useful tool in assessing the combustion efficiency of an engine, if rapid depletion is observed [ 4 ].