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Just put a gauge on them (injectors) and see if they hold pressure.
I've seen bad 02 sensors drop mileage by 25%.
Your VX should putt along at 30 MPH in 5th at 1000 RPM smoothly.
A flow test of the injectors, comparing the volume of fuel would be a good idea. It's very possible that someone replaced one with the wrong replacement, especially if you see evidence of tampering.
regards
Mech
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