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you need a way to live track with reasonable accuracy three things: engine load, rpm, and short range or jnstant MPG. For the best hypermile strategies the first one is the most important. If you are concerned about expense and stealth, the ultragauge is a much better strategy than wheel covers. You can learn to drive in the optimal load band, or closer to it, with you paddle shifter auto trans. Your car wil, look the same, the wife won't object, and over 10 or so tanks, with skill, you'll get your $70 back. The wheel covers will never be atealth, especially if you use cheap materials to save cash.
With a grill block, airdam, tire pressure 5-10 psi above sidewall, and a gauge and driving technique, your car will look almost exactly like it does now, and it will get significantly better FE with your same techniques, as long as weather cooperates too. Even if you akip the gaufe... do the others because you should see a difference. ☺
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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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