It also says that the Adder can reach 405km/h, around 250 mph...
Sounds about right.
The top speeds listed on the car websites are complete bullsh*t.
Actually they're not, but they are not 100% accurate. On the website it has the T20's top speed at 220mph, and the average speed most players can get it to go is about 135mph. Now if you did not know 220kph is about 137mph. I think R* just got lazy and used kph, and mph interchangeably.
I think that car is ugly (yes both real and ingame) so I have not looked at that one. However I just looked and at least on PC the website says "Up to 215mph" and again it will reach 215 kph.
I'm sure they mean MPH. They aren't dumb. They are just fictional numbers based on the cars real life top speed in MPH.
I highly doubt they were lazy on every single cars description in the game.
Also, the T20 cannot reach 135 mph under normal circumstances.
It does for me. In the top speed challenge I can get 143ish maybe a bit faster going down hill. It common to see this on PC, but I know most people on these forums don't want to think there is any difference in between the PC and console versions like that.
He said normal circumstances. The reason why you are hitting those speeds is because of the many variables in free roam that can change top speed. This includes curb boosting, going over bumps on the road and going downhill. You will not, however, hit those speeds when driving in a straight line on a flat road.