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Unfortunately gas engines don't get the best efficiency with cold air.
On paper it might look like cold air is more efficient in a gasoline engine. It is if you want to make more power cold air is better. If you want efficiency warmer air is better.
There have been a member or 2 on here that tested warn up times with a cold air intake versus warmed air intske and it cut warm up times by a 2 or 3 minutes.
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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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