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Welcome. I have a very similar attitude about the "green"‐‐both the environmental and the cash connotations.
Start fuel logs here at EM for the F150 and the Mazda3? Tracking FE is good for mechanical diagnostics and also charting progress.
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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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