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Pretty sure the Focus is not a return loop fuel system, only one line from the pump to the injectors. The pressure regulator sends a signal to the ECU which sends another signal to the fuel pump module, which varies the voltage to the pump and the resulting fuel pressure variation.
Whew! complicated system, but bottom line is the fuel gets heated by the engine itself, potentially providing better vaporization.
Sentra's test while very thorough was in ambient temps no where near as dramatic as some members here experience, so the WAI may help your mileage to a significant degree if your ambient temps are below freezing, more so if they are significantly below freezing. Some here are dealing with cold so severe that they could probably cool their engine with just the heater core!
I love the idea of a heater core in the air filter intake housing. The only downside of that would be it might make the coolant coming out of the radiator even more cold which could reduce mileage a little but probably not much.
One of the things I think would make a heck of a lot of difference would be to have adjustable venetian blind like louvers in front of the radiator that were thermostatically controlled by the radiator return hose to the engine. This would be an automatic radiator block that maintained a constant return coolant temperature (radiator to engine) at temps similar to summertime.
If you feel the top hose (engine to radiator) then the bottom hose (radiator to engine) you will feel the difference in coolant temperature. With a new radiator and very cold temps the return hose will be pretty cool, sometimes even lower than your body temp.
The hotter temp you feel in summer means the coolant removes less heat from the engine so it should mean more heat dedicated to combustion.
Watch those FINGERS!
regards
Mech
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