Thanks for the support guys
Let me try and explain a bit better.
The previous mileage is imported from the XML file and is saved from the last time the only input required from the user is the current mileage, litres filled, cost per litre, petrol station used and grade of fuel.
The rest is filled in automagically Gallons filled is a formula from litres so no harm putting it above as I hate all this metric business!! The layout is just a rough sketch if you will at the moment it's more to get the back end code working correctly than anything.
The save to XML saves all data to an XML file which I have discovered opens really well in Excel 2007 this will allow you to make graphs of MPG, Price per litre/gallon etc Average mileage per tank etc. All good useful stuff and useful.
Hopefully I can figure out how to skin forms in C# so I can add a bit more glitter to it and hopefully get it made into a plugin for a few different Frontends.
It's something I coded for myself but realised that it may be useful for others too.
Think that about covers it, any more questions just ask and any offers of assistance don't be shy
regards
Monza