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          or from petitioner’s residence are nondeductible commuting                  
          expenses.  The record provides no reliable basis for segregating            
          petitioner’s nondeductible personal use of his automobile from              
          any business use (e.g., trips from Romer & Co. to a local airport           
          or to purchase supplies).  For this reason alone, petitioner has            
          failed to establish entitlement to the claimed mileage                      
          deductions.                                                                 
               Even if we were to assume, arguendo, that whatever miles               
          petitioner might have driven in the course of normal and                    
          deductible business travel could be, on some rational basis,                
          segregated from his commuting mileage, petitioner has still                 
          failed to substantiate his expenses adequately.  Passenger                  
          automobiles are “listed property” under section 280F(d)(4)(A)(i).           
          Thus, the mileage expenses are subject to the heightened                    
          substantiation requirements of section 274(d), and no deduction             
          is allowed with respect to the listed property unless for each              
          claimed expenditure or use of listed property petitioner                    
          substantiates the requisite elements of amount, time, and                   
          business or investment purpose.  See sec. 1.274-5A(c)(2), Income            
          Tax Regs.; sec. 1.274-5T(b)(6), Temporary Income Tax Regs., 50              
          Fed. Reg. 46016 (Nov. 6, 1985).  Petitioner has failed to satisfy           
          these statutory requirements.                                               
              Petitioner claims mileage expense deductions based on his              
          application of the Federal standard mileage rates to miles he               
          estimates that he drove in business travel.  These mileage                  
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