Only things I can suggest are first to be patient. O nibbles in a month is hard to take but they will come. Secondly the rising oil prices won't help. It won't eliminate the market but will cool it somewhat.
Thirdly: Advertising.....far and wide and if you haven't already, spend a buck or 2 on ads.-- don't forget Kijiji, Auto Trader, friends, meets, forums, for sale sign in the window.
Spring is a good time for selling obviously but make sure the price is fair and be prepared to dicker.
G/L with your sale
C.