Still runs well with NPG+, I get better mpg with short stop runs ( I assume engine doesn't cool down). Overall, the engine seems to run quieter. Occasionally, the temp rises about 5* with AC on and hot weather (95* plus) - as soon as the get back to cruise at 35mph or more it drops back to 85*. I hope this helps.

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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k