Go to Lamborghini.com, go to models, under Gallardo there will be different models pick one, and under the name you'll see overview and technical specifications, click on technical specifications and your answer will be in the box that says performance.
As fast as you can drive it in reverse.
4.1 
315 km/h
315 km/h
Lamborghini Gallardo:199 mph,Lamborghini Murcielago:208 mph,Lamborghini Reventon;210 mph
500 milimeters per day
about 250mph but its not as fast as the mucelago roadster with a 850hp v12 engine it can go up to about 300
The most powerful model can get there in 3.4 seconds.
There are various 2011 Lamborghini models. They are: Gallardo LP560-4, which can go around 202mph and Aventador LP700-4, which can go about 217mph
Top speed: 202 mp/h
The Aventador has a top speed of 217 MPH and the Gallardo 570-4 is 202 MPH.
The model range for top speed varies. Some can go 309 km/h, while others can reach 325 km/h.