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Poor diesel mileage

(2010 Volkswagen Jetta TDI)
in Merritt Island, FL on August 02, 2013
2010 tdi jetta 13000 miles when i bought it last month. kept in garage. seller said he got 45 mpg . car was used very little. I get 30 to 35 miles pr gallon. every body I talk to gets 45 to 50 miles per gallon even 10 year old vw diesels. vw dealership says everything checks out ok. at 70 miles per hour , tach is at 2400rpms.
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Popular Answer
of Karmakanix on November 29, 2014
Simple stuff would be air filter restricted. Very low tires?
6 speed transmission or automatic DSG?
No check engine light (MIL)? Most causes would also turn on the check engine light.
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