Welcome. Your easiest, low hanging fruit still is the tire pressure boost Old Mech noted and the gauge Fat Charlie just recommended. Tire pressure is free. A UG (UltraGauge) is $70 US. But the UG will pay for itself in a few tanks, and it can help you detect engine trouble, and allows you to read engine trouble codes that explain what set off the check engine liht when it happens. I'd do those before a bellypan.
Good luck.
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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