CAR OCTANE MPG ORDER
1  87  33.48  2    
1  89  34.20  3    
1  93  35.30  1    
2  87  33.23  2  
2  89  33.79  3  
2  93  36.10  1    
3  87  32.95  3        
3  89  31.25  1  
3  93  32.70  2