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You are correct about the underside, which has three aluminum tanks that are relatively flat. My exception is that I added an air dam a few years ago when it had a tail happy issue at high speeds or when trucks passed. That has been solved so I need to consider if the air dam helps or hinders gas mileage.
I also have started driving about 55 mph for long trips and that alone helped a ton. Also I added a vacuum gauge to assist in keeping my foot off the gas pedal.
What I REALLY need is an instanteous gas efficiency gauge to help me determine how to continue improvements and to evaluate changes, e.g. removal of the lower air dam, adding a cold air intake, increasing tire inflation, etc. I already have LRR tires but need to fix an intermittent sticking brake pedal that does not always return to full up and causes dragging brake pads.
Thanks for the suggestions. -- Larry
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