I have just purchased a Fia grill cover to help with faster warm ups and maybe reclaim some lost MPG when it gets frigid this winter.
My question is, what is the ideal intake manifold air temperature and when would the action of blocking off the intercooler be counter productive?

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TWO Identical 2005 Liberty Sport CRDS
#1 CRD, 174,000 miles. Eco tune, Samco hoses. Mobil1 0-40w used since day one
#2 CRD 143,000 miles. Bought used (unknown history) with 100,000 miles. Samco hoses.
Eco tune, new rockers, and 5 volt glow plugs installed at 124,000 miles

Subscribed, I am thinking buying the same thing. I have been eying the Fia since last winter!

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-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.