Better to just stick a a lebel on the dash indicating the location of the fill hole. That way, there is no arguing which to be standard, and you can so fit already existing cars.

if all filler caps were on the same side, all filling stations would need to be re-designed

I don't see how this idea would require gas stations to be redesigned. I miss my old Chevy Malibu, which had the gas port hidden behind the rear licence plate. Worked fine nomatter how you pulled up to the pump. Just flip down the plate and fill'er up!

Honda's are on the drivers side.

You're right it is much more convenient.

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