SNS3Guppy said:
Most light airplanes have a glide ration which approximates about a 6:1 ratio or so, though some as little as 3:1.
I've come late to this discussion, so will merely observe that SNS3's observation is wildly inaccurate.
The vast majority of light aeroplanes actually have best-glide ratios in the range 9:1 to 12:1 (just over 10:1 in the case of my A36 Bonanza), although a small number of examples can be found either side of these boundaries. Modern jet airliners do somewhat better at >15:1, and high performance sailplanes can be up around 60:1.