Get a couple fuel fills with the board under the left rear tire. you mileage calculations should be much more consistent.
The temp gauge needs to be just below half way up the gauge within 1.5 miles after a cold start or the engine is not getting warm enough. If it is working right, get a MPG reading from a couple of fills and run a can of chevron techron through the fuel.
Maybe a little road trip before the next fill and lets see what the mileage is.Try to fill consistently at the same station-pump.
regards
mech
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