I put in r152a last weekend to give it a try, but I am not getting as good as you report. 100F today here and got 49F driving and 58F idle

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k