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I installed my block in order to keep the engine at a consistent temp. On the freeway the thermostat would close and sometimes the ECU would go to open loop briefly. This wasted a massive amount of fuel. I bet the increase in fuel economy I saw wasn't from aerodynamic but just the fact the engine would stay in open loop... Plus a side bonus is it protects the radiator from damage. I have seen many bugs splattered on it and a few dings from rocks...
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