The Volkswagen XL1: 147 mpg car.

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28. Classic

The 1956 Mercury Montclair included all of Mercury’s evolutionary engineering. The ’56 Mercury Montclair included factory air, which was a new option in Mercury vehicles as of 1955. The ’56 Montclair also offered an “on-demand” low-gear kickdown for an extra cost with Mercury’s three speed “Merc-O-Matic” automatic transmission. The “Merc-O-Matic” was actually Ford’s first automatic transmission, which was introduced in 1950. In general the transmissions were given the name Ford-O-Matic but when a Mercury vehicles was marketed, it was given the moniker Merc-O-Matic.

The 1956 Mercury Montclair was no slouch when it came to power. It had a large V-8 engine with plenty of horsepower: There were two options available for the 1956 Mercury Montclair:
225hp 312 c.i. V-8
335hp 312 c.i. V-8 with a 4 barrel carburetor

In terms of what type of Mercury Montclair was produced in 1956, here is the actual production breakdown:
Convertible: 7,762
Hardtop Sport Coupe: 50,562,
Phaeton Hardtop Sedan: 23,493

The hardtop sport coupes were produced the most while the convertibles were fairly limited in production in 1956.

Since the Montclair was a premium Mercury vehicle, the interior would have sported upholstery that was comprised of leather and vinyl.