It is a sad state of affairs when the most obvious and easiest solution is made cost prohibitive. I know with the diesels, just having a CNG or propane assist usually doubles the mileage. If you look up Technocarb, they have the pieces convert engines to direct port style injection. Eliminates the driveability problems, and they have probably been at it the longest.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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