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Opening the injector line allows WOT with no fuel. If the "pumping losses" are as significant as some on the EGR for MPG thread suggest, engine braking should be reduced by opening the throttle while coasting downhill in gear.
So if my 91 calif. Metro goes noticibly faster down my test hill with the throttle open than shut, then reducing output by adding EGR up to the misfire limit and keeping the throttle open will pay MPG dividends. If coasting down the hill in gear, inj. off, throttle open does not go faster than throttle closed, then the increased EGR is a dead end.
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