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water injection
keeps head temps low, water expands well in the heat of the engine, mixed w/a little alcohol and you get over-all better octane rating, and a kit is less than $200.
Should buy you 1-2miles/gallon. That is huge over a year or two.
This setup also will help prevent dieseling and help retard dirt accumulation on valves.
Cheap generic kits on Fleabay.
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