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Gasoline engines tend to like warm air. I ran a thermostatically controlled air intake set for 94F. That made the carb run a lot more consistently and a lot better in cold weather.
Diesels like cold air above 20 to 50F. It really depends on the engine, turbo and intercooler setup. Every engine is different basically have to test it to figure out what your diesel likes. If the engine is breathing in near freezing cold air (after the intercooler) its more than likely hurting mpg.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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