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Or .... long tests let changes in the weather skew the results even more.
You all know where I stand on on-road testing:
- vehicle warmed up (drivetrain stable, not just water temp)
- cruise control, set once, cancelled with the brake
- deserted road (runs thrown out where you are overtaken, or catch up to another vehicle - aero interference)
- bi-directional runs
- A-B-A immediately following one another
- multiple runs per set of A, B, and A
- readings taken with a fuel economy computer
And even this isn't always good enough.
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