Travelling costs Vs a Henley Compact

Against the cost of a Henley Compact Office (on a typical high street loan it's about £99 a month) travelling to work suddenly appears very expensive.
Over the average 250 working days per year - the Henley Compact costs £4.75 per day.
Question: Including all the fares, parking, fuel, insurance, depreciation and even congestion charges (!) involved in your journey to and from work just how much would a Henley save you each year?
