I do indeed however my 2nd map is for emergency supermarket fuel if i ever get stuck without shell garage, it's an esl board which is only usable for cars up to 1998 so may not be of any use to newer members, have to look at the other options, what year is your car mate ?
Carberry open source mapping may be worth checking out, mfnick has it on his sti, think you can have twin maps and will be about 300,