OK, so I'm a bit nerdy and have tracked all our financial expenditure, as well as car fuel expenditure and relevant mileage, for the last 12 years.
I decided I'd do a 'cost per mile' comparison between my car and my bike.
It made for rather frightening reading!
Car (petrol, automatic, quite large) - since 19 August 06 when I bought it
Total running costs (fuel, insurance, servicing, tax etc) - £8,047.53
Miles driven - 19,020
Cost per mile - 42p
Cost per mile incorporating car purchase price - 78p
Car 2 (husband's) - diesel automatic, smaller, since 15 December 2001 when we bought it
Total running costs (fuel, insurance, servicing, tax etc) - £16,519.35
Miles driven - 98,985
Cost per mile - 17p
Cost per mile incorporating car purchase price - 26p
Bicycle - Trice Q - recumbent trike - since mid-May 2008
Total running costs (accessories, maintenance, cycle clothing and shoes, etc) - £1,406
Miles cycled - 3,495
Cost per mile - 40p
Cost per mile incorporating trike purchase price - 95p
Clearly my husband's diesel car has been the best value by far, but my bike is only marginally cheaper per mile than my turbo petrol automatic car. Gulp!