Quote:
Originally Posted by MetroMPG
Brick: I'd be wary of A-B-A that spans any time period greater than, well, an hour. How are you going to control for seasonal changes?
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You can't control seasonal changes, so the plan is to iterate more than once while things are changing. Along with fuel economy, I record whatever I think would impact a given trip...temperature, precipitation, whether the engine is warm from a prior trip, etc. If there is a genuine effect, it should show up in the distribution.
If I had my choice I would be testing on an instrumented research engine. So if anybody has access to one of those, let me know where to send the plugs when I'm done!