the Benelli Imperiale 400 should deliver a fuel efficiency of close to 35 kmpl. The bike has been fitted with a fuel tank having 12-litre capacity and hence, you should get a range of over 350 km ...
You may take you Bajaj Dominar 400 for a long distance journey after the first free service at 750kms. After that, the second service will be due at 5,000kms, giving you a range of around 4,000kms.