I've never had problems with +4s, regardless of the supposed "gimmick factor" others here have described. Personally, I think it's a good idea to have 4 ground electrodes rather than just one.
Convince your wife, by mentioning that you'll be saving roughly $3.50 per tankful (or whatever gas happens to cost in your area). Without wheel covers, and using your fuel economy figures, you could go for about 261 miles on 18 gallons of gas. With wheel covers, on the other hand, you could go 277 miles on that same 18 gallons of gas. Or, you could go 261 miles using 16.9 gallons of gas.
I am using a JGC fan, and many people over at Dakota-Durango.com are using either the JGC or the Lincoln Mk VIII fan. The Ford Taurus fan is also a popular switch, now that I remember it.
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