To recover the cost of expensive garage equipment
							                                
                                        
                                    
							                        
                    
                            To discover which fuel supplier is used the most
							                                
                                        
                                    
							                        
                    
                            To make sure diesel and petrol engines emit the same fumes
							                                
                                        
                                    
							                        
                    
                            To help protect the environment against pollution
							                                
                                        
                                    
							                        
                     
	 
	