I just picked up a SWEET 1985 300D Turbo. 206k miles, Beautiful car inside and out. I checked the mpg after filling up the 2nd time. 18.5mpg ????

I was told be the previous owner that 30mpg was the norm and told by Pierre that 28ish mpg could be expected. What the heck is knocking it down 10mpg?? Pierre said he thought my valves need adjusting(they are tight he said). Is this alone the problem or are there other factors?

What car do you have and what MPG do you get?

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2006 Jetta TDI DSG 320k miles
1997 Ford F150 325k miles 4.2L V6 "Work Truck"
2008 Tundra 225k miles 5.7L
1982 240D.....sold
1984 300D...Totaled OUCH!
1985 300D Turbo 222k miles "Dos" sold to 79Mercy
1986 300SDL 98K miles "The Beater"....sold
1987 190E 2.3 16v Euro spec 115K miles....sold