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How long is your commute?
What is the average speed?
Unfortunately the VX loses lean burn capability for a significant amount of time after engine shut down, which eliminates the lean burn advantage, as well as potentially making the 02 sensor cool off and possibly not give you closed loop.
How long does it take to warm up-possibly thermostat not closing properly?
EGR circuit clogged?
Top gear in the original transmission should give you about 30 MPH at 1000 RPM and the car should pull away from that speed even at that low RPM. Short shifting is an essential part of VX mileage, unless your speeds are just to low.
Look at Pale Melanasians mileage on his DX. It has none of the design advantages of the VX except it is also a Honda.
His mileage would probably be lower if he drove a VX, due to the low average speeds and high rates of DFCO. The Vx systems were designed more for prodigious highway mileage. On mine I did well in the city but I did not use DFCO, knowing it's effect on lean burn and 02 temps.
Tires are also a crucial part of the VX package. I could push the car on flat smooth concrete with one thumb.
regards
Mech
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