Since we've gone off-topic discussing old cars, my first was an Austin A35. It averaged 36mpg however it was driven and the fuel tank didn't cost much to fill since it only held 5.7 gallons so would need to be refilled at about 180 miles. The Zenith carburettor needed frequent maintenance to keep the engine running smoothly. I had removed it so many times that I could do it my torch light to take it indoors for cleaning. The heater was an optional extra, which the car had, at least until I blanked it off as it was leaking. The advertised 0-60 time was just under half a minute, helped by a very light gear change.