This simulation run uses 2 pumps and the following random number seeds:
         1         2         3         4
  Current Total  NoQueue Car->Car Average Number  Average  Pump    Total  Lost 
    Time   Cars Fraction   Time   Litres  Balked    Wait  Usage   Profit Profit
-------------------------------------------------------------------------------
    2000     32   0.365   62.500  33.606      5   79.902  0.987   -16.66   3.55
    4000     73   0.259   54.795  33.626     19  104.945  0.993     6.63  14.74
    6000    122   0.173   49.180  34.570     45  214.501  0.991    25.06  40.38
    8000    149   0.222   53.691  34.690     56  201.399  0.952    41.81  47.41
   10000    183   0.239   54.645  34.510     67  184.811  0.948    61.87  56.01
   12000    211   0.234   56.872  35.224     74  176.170  0.958    83.90  61.91
   14000    242   0.248   57.851  34.762     79  181.328  0.955   103.86  66.45
   16000    284   0.217   56.338  34.956     98  204.478  0.958   125.44  82.74
   18000    323   0.197   55.728  34.616    112  204.344  0.962   146.19  93.33
   20000    369   0.177   54.201  34.614    135  216.659  0.967   166.80 112.52