I don't think gliding in drive has much likelihood of being helpful for FE. But it is important to have a consistent technique for measuring fuel use in order for your test to yield information that can help you understand what is happening. How are you measuring fuel?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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