Multifuel engines tend not to be optimized for any fuel, so run less efficiently than would be possible on all fuels. Every engine is a compromise - imaging having to include all compromises, and having to comply to all emission standards.
Multifuel is an asset when the supply of fuel can be an issue - i.e. in military situations or extremely remote areas - but it's just not worth it on vehicles for everyday use.
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Strayed to the Dark Diesel Side
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