Usually in america cars are measured in inches but any measurement will work as they're convertable. Just stay away from the measurements like lightyears and parsecs. Your car isn't quite THAT long. In Europe it is more common to find cars lengths measured in centimeters or meters.
Centimeters.
miles
swagg
A centimetre would be an appropriate measure.
A tape measure that measure in feet and inches (or meters and centimeters) would be most appropriate.
A centimetre would be appropriate.
The meter.
feet
from one bumper to the other bumper
By unit of length and distance and conversion ,we can say that the most appropriate unit to measure the length of a finger is cm.
You would use inches.
Grams is no good - it is a measure of weight not length. Kilometers measure length - but only if your table-top is a few miles long. Most appropriate would be Meters - your average dining table is about one-and-a-half meters long.