Clark - The hair dryer should be used to pump hot air into the intake, as close to the manifold as possible. That will make it much easier to start the engine, even without waiting for it to all warm up first. It is similar to the intake heaters found on some diesels instead of, or in addition to, glow plugs.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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