The following analysis is based on published data on all production cars of 2006, looking at power, weight acceleration and emmissions. Each point on the chart represents a particular model of car.
Looking at just acceleration against power shows a clear relationship between the two but there is a wide spread especially in the region 100 to 200 bhp. At 150 bhp the 0-60 times of production cars vary from around 5 to 15 seconds.
If instead we look at power to weight ratio the variance closes significantly revealing a more distinct curve. In this case cars with 150 bhp/ton have a 0-60 time of between 6 to 8 seconds, typically around 7.
If you know the power to weight ratio of any car you will have a pretty good approximation of it's 0-60 time from the equation t=350*(p^-0.78). Where p = power to weight ratio.
To see the efficiency a particular car is for it's level of performance we compared the emissions with it's 0-60 time. If the point falls below the line then it is more efficient than average for the level of performance.

Some popular engines...
EnginePower (bhp)Emissions g/km
Fiat 110054148
Fiat 1.2 16v80142
Fiat 1.4 16v95142
1.4 K series 16v103164
1.6 K series 16v111172
1.8 K series 16v120173
1.8 K series 16v VVC160179
Ford Ka 1.3 EFi70163
Citreon C2 1.475143
Ford 1.4 16V80169
Clio 1.4 16v 95155
Honda 1.6VTEC 110157
Citreon Saxo VTS120194
Citreon C2 1.6125163
Alfa 1.8 TS140195

Note : Emission figures are based on use within the car intended and only give an idea as to it's efficiency used in the Animoto buggy. The reduced weight will lead to greater efficiency in terms of CO2 per km.
Taxing the buggy will be based on the donor vehicle if an age related plate is issued. For cars registered before 1st March 2001 there are two tax bands based on engine size; above and below 1549cc.