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			 Registered Member 
			
			
		
			
			
			Join Date: Apr 1999 
				Location: sterling co. usa 
				
				
					Posts: 27
				 
				
				
				
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			 I have a '78 mustang II with a four cylinder, 3 speed automatic.  the tire size is 155/80 R 13.  my current gas mileage is about 10 miles  per gallon.  will bigger tires make my mileage better? Are these tires too small for this car?  These are the same size tires as they were when I bought the car.  Will a 215/70 R 14 or 185/ 75 R 14 be better or worse? 
		
	
		
		
		
		
		
		
		
		
		
	
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