magnatom said:
Absolutely no idea. Probably quite a lot. I got the bike when our first child was born. We would have needed a second car otherwise. So instead we have just the one (admittedly big) car, instead of two.
Likewise, I started biking shortly after my son was born. Not had to get a 2nd car and have not yet needed to upgrade to a bigger "family" car.
No idea how much I've saved - probably broken even or slightly down on cost on petrol when I add up cost of bike, bits, and clothes - but not paying for 2nd car/mot/tax/insurance/etc.. means I've got to be in the black (haven't I

)
chrisk said:
That isn't the full story; I'm planning on moving further away from work (I think I must be the only person who wants a longer commute...)...
I'm struggling to get in longer routes to work. I can't find an easy way to add a little distance without using a really busy road. The other option is to go round the back of the Malvern hills, but that'll add >10miles and I'll either be late for work or have to leave earlier (and upset Mrs and mini Grhm's morning schedule). I too have wondered about moveing house or job to get a longer commute - so you're not alone (and I suspect we're not the only ones)