If you aren't flooring it occasionally, your vehicle is grossly over-powered, which is wasteful, but typical in the U.S. Long ago I was in Indonesia when they were advertising the new Super Kijang minivan with the new powerful 1.0 L engine. You should see the loads they carry there. People say my 2.4L minvan is under-powered, but if I floor it so it downshifts and let the 4 valves/cyl breath at high rpm I can pass easily. Don't be afraid to spin your engine. That is where the HP lies.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans