Because i am drunk and bored.......
Say current price of BP ultimate $1.60, therefore 2 cents gets you 0.032Litres
Say fuel tank takes 65L, therefore need to do the 2 cents thing 2031.25 times.
Say one time takes you 30 seconds to fill up, walk in, talk to attendent and walk out again to start again, therefore it takes 60937.5 seconds. Which is equal to 16.927 hours.
There is your answer.
You just wasted 5 minutes of my life.
Thanks.