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Originally Posted by Fasterthanyou
Not it won't.
Doing a coil upgrade won't help, going to a setup like CNP will. Even then it won't do any cleaning of the combustion chambers.
Those tires and the lift kit are the biggest problems with your truck. The cover will only make measurable results with highway speeds. Anything 50 and lower will take 10+ years to make up for the cost of the cover.
Try inflating the tires up a bunch, that should help too. Oh, and a grill cover made from sheet aluminum could also help. Just get it up as close to the back of the grill as possible.
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A hotter ignition will definitely help clean up the combustion chamber by burning off all the buildup. I've seen it personally on several vehicles and my boat. I've measured the performance/mileage increase on my SS454. I picked up a solid 1 mpg with the distributor/coil swap. I had already changed the plugs and wires and it didn't change my mileage. With a hotter ignition you can also increase the plug gap a little which also helps make it more efficient. The 35" tires hurt big time, I ran 32" tires on a 4 cyl turbo 4Runner and the best I could get was around 15 mpg corrected for the bigger tires. But in the end, I would be surprised if you can pick up more than a 1 mpg increase.