You are nitpicking about little things. Those type of things can indeed cause your calculations to be off by 1, maybe 2 mpg. But this is not the problem - 19 mpg is far, far too low for a CSVT.

I do agree with the UIM/LIM cleaning. Do it and see how much that helps - after, of course, checking the fuel filter.


E0 Silver Frost CSVT #3095/6535 Alpine CDA-9851