It would increase fuel consumpton but that is the least of your problems. You would need to re-programme the whole engine management system, there are companies that can do this but it will be expensive. The cheapest option is trade it and buy the V6 version, if it is the 4litre that Toyota fit to the 4 Runner then 245hp should be enough!!!!
PS Dont think about fitting a V6 into your truck, all the wiring and many other parts are different.
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