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A grille block will really work well. It may need adjustment per season, but a Scanguage will show you your temp and you can see what it really is operating at. The hottest I ever got my engine was 220F, and I have not had any issues with it. A belly pan can take maintenance if not done thoroughly, but if you put the time and work into it, it will be solid and stable- and at least for me, it works wonders.
I would suggest a Scanguage to help see actual vehicle mpg, and definitely start pen/paper for your tank results. I keep track of mine in real life, SC, Ug, and car readout. UG is always off because I have never set it up, but one can see the difference between the way I drive and the readouts.
For what you described wanting in your first post, a 2011+ v6 Mustang will do all of that for you. With it getting closer and closer to 2015 release time, you might want to switch to a 2014 (being sold cheaper with the new model coming out) or just wait it out for the 2015. A lot of people speculate April 17th will be the release, I don't know when, but it should be coming up.
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