Join Date: Nov 2000
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Re: Help on 4.2 power&mileage!
The plugs should be a light tan color. Like lighty browned rye bread toast. Throttle response should be good, and timing should be advanced till it pings, then backed off just enough that it doesnt'. With 33's, 4.56 gears and a T5, I get 17 mpg for a combo city and highway using either the Motorcraft 2100 or the old bbd.
Are you heavy footed? I drive a bit like a granny, so that may be my milleage secret.