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Originally Posted by JSH
CNG has become increasingly popular because fracking reduced the cost of natural gas and CNG trucks do not require diesel particulate filters or urea injection to meet emission standards.
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I have already seen a handful of trucks fitted with dual-fuel CNG setups in Brazil. Odd enough, an Euro-3 truck with a sequential CNG port-injection is as clean as an Euro-5 counterpart running only on Diesel fuel (and the DEF if it doesn't resort to the EGR instead).
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The equipment required to meet emission standards are moving customers away from diesels. Not just for light duty vehicles but also in the medium duty class.
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Even though I am mostly favorable to Diesel engines, sometimes it does seem to make sense resorting to CNG or ethanol in order to decrease much of the troubles with newer aftertreatment systems.
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There has also been a recent increase in gasoline school buses.
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A comeback for spark-ignited engines on buses in my country is not so likely, but if it ever happens I would place a bet on either ethanol or CNG and biomethane. Dedicated school buses here are more common for rural routes, so eventually resorting to locally-produced biofuels could make sense.