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Trust me I too was very frustrated by those two once in a life time hits. Out of 15 cars and a bunch of tests on my Mercury.
That is why I said we were unable to fully test these two cars by a 300 mile run on I10 to Blithe CA and back nor to recreate it in any other cars.
Which I pointed out.
Later results with the Dutchman system also showed farther flaws in their system with how the convertor had a short life and how prone to contamination the air intake was from the later chemical used.(the frozen idle motor)
Also in our summer heat the hoses got too soft and would slip off their connectors.
I dropped the company and tried farther testing with better (seemly) systems but never got any changes, to the point of putting a large store bought tank of pure hydrogen in the back seat and feeding it to the engine.
I feel this last test proved that up to around 6/7 litters of hydrogen made no change, no improvement at all. So hydrogen is dead to me.
I did get repeatable results with changing the Mercury's A/F ratios, but after 16.5 the MPGs start dropping off.
The best I could get was 35MPG @ 65MPH, with a large drop of power if left in that setting at the stop light, and passing.
And oddly I could not even get that in the summer here in Phoenix, the heat seems to kill it.
I have been told other engines might support higher A/F ratios but to relocate the stuff to test for it is too costly to try.
I am left with only two ideas left to try.
A second overdrive to kick the driving RPMs down to around 1500/1700 @ 75/80MPG for highway driving. That is the engines RPMs at 65 in its stock overdrive gear. I really feel it can pull it at that speed, as it seems to have plenty of power/torque.
OR Pure gasoline vapor.
And adding a second overdrive is a costly feat, and not practical for nearly all cars, Gas vapor is the only one left that can be used by many.
Rich
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