Which car are you driving? The VW or the Toyota? Both are good candidates. Look at P&G (pulse & glide) and EOC (engine off coasting) on the lists of techniques. And look at DwL (driving with load).
Better than an oil change by leaps and bounds would be an Ultra Gauge. Unlike the lighter oil, the ultra gauge will pay for itself in a few tanks You can use it to perfect hypermiling techniques.
james
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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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