The ps figures are to keep those tree huggers in Brussles happy so they seem as if a car is less powerful. The KV6 puts out up to 190bhp depending on the state of tune, ie in the ZT it has 190 at the flywheel while the ZS has only 180bhp. Similarly with the 1.8 the ZR and ZS come in both 120bhp and 160bhp versions, however that is with the addition of a VVC unit to get the 40bhp power hike.
To be honest the MG rover website is wrong. Check the engines out at[url]http://www.austin-rover.co.uk/index.htm?enginekseriesf.htm[url/]