I recently purchased a 1973 Super beetle with a 1600 cc engine. Compression is fine and the engine runs good after a thorough tuneup. The car sat for a few months and only get's 15mpg. Causes?

Asked by Oct 30, 2016 at 12:24 AM about the Volkswagen Super Beetle

Question type: Maintenance & Repair

I recently bought a 73 Super Beetle.  After my mechanic did a thorough tune up and did a compression test the car runs fine.  But after doing 2 averages on fuel vs.mileage I'm only getting 15 miles per gallon.  Using unleaded fuel.  The car had not been driven for several months.  Could this be the reason my mileage is bad. I've owned 7 V.W.'s, several of them Super Beetles and usually get 24 to 28 m.p.g.  Any thoughts one what could cause the low miles per gallon?

2 Answers

70,335

Sometimes with new spark plugs you can actually lose gas mileage until the plugs get broken in. I never believed that until it happened to me. HTH. -Jim

1 of 1 people found this helpful.

It very well could be. Rings are known to take a set and it takes months to recover. You could add a can of CD-2 oil detergency package which will help with gummy rings.

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