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ORIGINAL: 97 3.5 Intrepid
I get about 27-29 mpg mixture of city and highway driving 30%/70% around 55-60 mph (on the highway part) and I get about 31-32 mpg on 5%/95% (65-70 mph) highway driving on my 1997 3.5 24v SOHC. My secret is the K&N drop in filter, 89 octane-10% ethanol at stations on the "Top Tier Gas" List http://www.toptiergas.com/retailers.html only, and lightly accelerating in my car so then the engine runs under 2k rpms at all times.
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Suprisingly you get better gas milage with Ethanol... USUALLY it decreases gas milage and it also gums up in your fuel system easier. As far as using E86, you shouldn't see any improvement over 82. E82 burns cooler and in winter it burns worse. The only good thing about E82 is it has more detergents. Higher octanes are for vehicles with higher compression and need cooler fuel to prevent detonation. Which in turns means it won't burn as complete in a lower compression engine... Stick to E82