Mazda has now proven that 13 to 1 compression is possible with 87 AKI regular, which is actually closer to 85
Yes but difficult to replicate in an engine without direct injection like mazda uses.
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But if you are building a Dakota for MPG it is hard to arguing for using a 360 when dual plug 5.7 Hemis with their 27 inch long intake runners are available for just a little more money.
Perhaps not an issue in your area, but around here good running 5.7's are still going for 3x the cost of a comparable 5.9. Not to mention dealing with the 5.7's ignition system in a swap is not a simple or cheap affair where the 5.9 will take any old SB distributor. The Hemi is superior, if you can bank roll it. Sometimes in a budget project, a guy just can't justify it.
