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Poor mans water injection.
I live in Tucson AZ. So we have Swamp "evaporative coolers". I noticed on my 95 Toyota PU that it "pinged" when it was over 95 degrees and less then 15% humidity. So I can solve that.
I put a small 8 oz water bottle on top of steering column. Put a "dripper" hose line. Something left over from the drip irrigation in the yard. Ran a line into the top of the air filter. So on hot dry days I drip water on my air filter. I get cooler moister air into the engine. It solves the "ping" problem on hot dry days. However I did nto notice a jump in mpg's. So buyer beware.
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