I just recently got mine on the road.The gear head in my thinks cooler temp more power but that isn't what this was designed to do.It surely doesn't need to get worse gas mileage lol so I will leave it and concentrate on other areas.I did a coolant flush saturday as it has been sitting for 2 years prior to me getting it 5 months ago.
As long as it doesn't cost me anymore money that it has to get safely running and stopping I will be ok.I am driving it everyday for a bit to make sure all the bugs are worked out then it will be a third car/inclement weather vehicle.