Quite possible. Does the European (fuel-injected) Ninja 250R use different gearing as well? Did they discuss fuel economy at all?I believe the UK version of the Ninjette is fuel injected and spotty fuel mapping down low could be the cause of the slower 0-60 times.
The performance figures aren't typically. Most reviews indicate that the Ninja 250R is quicker from 0-60 mph than the CBR250R by about 1 second. But these previous reviews came from U.S. magazine tests using the carbed version of the Ninja 250R. Still, it is a surprise to see a test where the CBR250R is actually quicker than the Ninja 250R by more than a second from 0-60 mph!