It does not sound so bad, 5mpg but I am talking about going from 26 mpg down to 15 and makes the overall average 15 so it is dropping 11 mpg. It won't be driven much until spring. It will get sorted out.
Ron, The Computer Greek I love therefore I am. 1954 3100 Chevy truck In the Gallery 2017 Buick Encore See more pix 1960 MGA Roadster Sold 7/18/2017