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Originally Posted by Old Tele man
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Actually, they got a nice 3% gain when raising the coolant temperature. Adding the coolant alone did nothing to improve economy, but when taking advantage of the coolant's higher boiling point and raising the operating temp to 215 the predicted efficiency gain was realized.
Also note that the cooling fans were locked "on" full time in both trucks to eliminate them as a variable. This probably had minimal effect on the outcome while traveling at high speeds/airflows, but in a city environment at lower speeds with stop and go thrown in, the potential for reduced fan on time could offer another advantage in efficiency.
Most people I see arguing against the Evans product hang their hat on the cooling capacity of pure water being much higher, but in reality most people run a 50/50 mix which has a much lower heat capacity than straight water, though still higher than Evans.
I'm very interested in this coolant. The only two things that hold me back from trying it are questions relating to performance with thermosyphoning tank style block heaters, and heater core performance in extreme cold. There's just not much information out there.