Fuel economy gauge is slightly off even though no ac is on. It stays like this whether in N or D. Looks like a vacuum issue somewhere, but idle is smooth at about 700 N and about 550 D. MityVac connected to vac line on intake shows about 16 - 17 mmhg. This just recently started. Other than economy gauge being skewed, I have not noticed any issues.

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1990 190E 3.0L