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Running hotter is more fuel efficient, but the vehicle isn't designed to run much hotter than it already is. Things will prematurely wear or fail when running hotter than the designed temp; likely 180-220 degrees. My fan comes on at 215 degrees. It's not efficient to run the fan because the electric power comes from the alternator, which is not efficient.
The Ultragauge is only $61-$70, so that is a more affordable way to go for instrumentation.
As an aside, there are many alternative phone providers besides the big 3 that have much better contract-free rates. My wife has a smart phone with unlimited talk/text/data for $25/mo through Republic Wireless. Other providers allow you to bring a used device and activate it on their network for very affordable monthly rates (Boost, Virgin, StraightTalk).
If you want to know about saving money, especially on recurring bills, I'm a bit of an expert. PM me if you want to know what I do to save on things like insurance, internet, etc.
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