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Old 07-01-2009, 08:30 PM
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Originally Posted by jamesb0 View Post
The spark plugs will not make the truck jump off the line but they do help burn the fuel faster and efficiently, so you might get 1 more mile to the gallon. Lowing the temperature by 15 helps from loosing HP. A little here a little there and before you know it You are going longer between pumps.
Lets say you improve by 5 mpg. 30 x 5 = 150 more miles to a tank.
The hemi is already efficient at burning the air fuel mixture those plugs will do nothing for fuel mileage.

As far as improving the mileage up to 5 MPG........ well that there is just to funny never will happen.

Putting in a lower thermostat doesn't improve fuel mileage at all if anything it hurts it. The computer dumps more fuel at a lower temp, thats why people do it to richen the mixture alittle on an already to lean motor.
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