DB, I thought you said you were a pilot. I think you are a salesman. Look at the RFM. Airbus probably haven't got the figures in the RFM for mass above 7500kgs which has not been certified yet but at 7500kgs (which would be about the half way mark out to your mythical 170nm) the RFM is giving a TAS of 151kt and FF of 540kgs/hr (SFC=3.576kgs/nm) at just below MCP. These are taken from the 3000'/0c graph. At the Recommended cruise setting, the figures are 145kts/515kgs/hr (3.552kgs/nm). Going up to 6000', the figures improve to 3.483kg/nm at MCP and 3.243kgs/nm at Recommended cruise. How do you get 155kt and 480kgs/hr which would give a SFC of 3.097?