The
Smart Fortwo
The Humbug from Hambach (France).
The Renault Twingo III
Seats 4 and has RWD.
Generally front engined RWD cars are less efficient than FWD or rear engined cars because of the higher weight. Cross mounted engines deliver power in the direction it is needed which is also helpful.
Having the engine weight over the wheels is good too.
I had to help push my neighbor's Mercedes back into his garage when he went out into the snow and ice, discovered it was too slippery to drive safely but couldn't get it back in without my help.
Then I went out with my Insight, had to; it cleared the same grade the Mercedes couldn't handle without a struggle.
It did not please him much I fear.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.