340 Gets Terrible Gas Mileage

They just dont seem to read or perform consistently.
>I think NGKs have a slightly broader heat-range which seems to work better in air-cooled stuff. Liquid-cooled Sportbikes like the NGKs too.
>Marine two-strokes with a good stat, once working, run a pretty steady temperature. Plus they mostly have just two modes of operation , namely idle and WOT; (sorta like my Plymouth,lol) plus the props govern their rpm to something like 3200-4000 rpm; (unlike my Plymouth which bounces of the limiter at 7500).
>But my SBM engine, in a streeter, after it warms up, she runs at 205 to 207, no more no less.