Posted this in a different section and got little feedback. My 2010 f-350 was geting 11.5-12.4mg for the last 25k mile...since new. Now, the last three fill ups were 15.8, 16.1 and15.6.....any ideas why? All hand calculated and no question it isnt done correctly. Is it just finally breaking in? Runs perfect, zero issues, stock tires, no mods or changes. I love it but wonder were a 40% increase is coming from.