When I got my first car in July 2006, I bought a notebook to keep a log of the cost of maintaining her. And for some crazy reasons, I also kept the receipts whenever I pumped her up with gas (petrol).

The cost of feeding her and feeding my lifestyle.

2006
Month: Average price of gas (money spent on gas this month)
July: $2.88 per gallon ($81)
August: $2.74 ($67)
September: $2.32 ($80)
October: $2.13 ($52)
November: $2.20 ($41)
December: $2.34 ($39)

2007
January: $2.23 per gallon ($64)
February: $2.22 ($22)
March: $2.42 ($73)
April: $2.90 ($79)
May: $3.05 ($47)
June: Vacation in Malaysia
July: $2.78 ($59)
August: $2.68 ($28)
September: $2.68 ($22)
October: $2.65 ($61)
November: $2.94 ($25)
December: $3.04 ($44)

2008
January: $3.00 ($43)
February: Lost the receipt
March: $3.24 ($38)
April: $3.42 ($40)
May: $3.70 ($43)
June: $3.96 ($45)