Welcome Steve,
The only tax advantages E gets now is in some states the road tax is a little lower.
I agree for best small engine starting run them empty, just seems wastefull during summer, end of season heck yes run them dry.
Most cars FI systems when they see they are adding 20% more fuel that what is programed they throw a CEL cause it thinks something wrong. With only a 12% drop going from regular to E85 is great. The 2 FFV cars I've owned both lost 18%. With E85 almost $1.00 cheaper in my area it's a OK bargin for me.
I've been playing with blending off and on for a few years. My Cobalt seems to like E40, 35.3 current 3 tank with average temps near 0f.
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