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I did similarly to my Camry recently and have yet to see any gains from it, but my last tank was an oddball because I drove in the rain for about half of it unfortunately so less is to be expected. However, as of right now with my lower grill blocks (upper is going to be tricky to cover because of it's shape) I haven't noticed the fans kicking in more (I would hear them, one makes a sound like a frog) and my temps haven't moved at all (and I'm actually very low on coolant right now, which reminds me I need to fill it up). It will be interesting, once I put the partial belly pan in to bridge the gap from the bumper to the chassis, if the heat builds up in any exponential fashion or if there are any real aero gains made.
That should be your next move though, once you're sure everything is ok where it is with the grill blocks, made a panel to cover the underside of the front of the car to seal the gap that is usually between where the radiator is and the bottom of the bumper.
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