Hybrid cars are pretty fast. This Audi goes up to 140mph, which is as fast as the 2015 Mercedes Benz C180. So. they aren't low at speed at all. The thing is, the way electricity is produced is way worse for our environment than a diesel (petrol) is. Additional to that (most likely because they're "new"), they cost a lot. This Audi will prolly cost about 80.000 (Basic price).