Have you noticed a change for the worse on your Miles Per Gallon since your cars are running cooler? I pose this question cause I have noticed ever since my water pump was changed, and I do not know what type was installed, the MPG have gotten worse although the car runs much cooler. I do not know if the thermostat was changed too, but if they did I would hope they kept the higher temp rating. Thats something I want to verify when I get some time off in Dec. I sort of suspect this over cooling of our engines is also messing up our emissions control by causing our engines to run richer, creating more carbon deposits/clogging ports etc.. and thereby using more fuel in the process. If you have noticed any difference in performance due to decrease in operating temperature, let me know, thanks.
