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Since you have a steel / cast iron rig its best to play with timing when cruising along, sadly you still have aluminum pistons which you could blow holes in though.
You could also setup lean cruise, you would need to determine what gear / RPM you typically cruise at and the coresponding load then create an island where you go in open loop or if you have a wideband end up with a lean burn situation, most engines run fine at 15-16.5:1 so long as you are loaded up between 40-80% (fluffy numbers), too light of a load and it won't fire, too much and you burn holes in pistons.
There are a couple folks on here who made vehicles go lean, higher compression and knock detection are a must when running lean, high percentages of ethanol work well for leaner than normal AFRs
have fun.
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