Here’s How Much Power and Fuel Economy Will Drop Once VW Fixes its Diesel Engines

Here’s How Much Power and Fuel Economy Will Drop Once VW Fixes its Diesel Engines

When Volkswagen finally recalls its diesel vehicles, owners may be in for a surprise once they get their vehicles “fixed.”

And the surprise isn’t the good kind either.

Consumer Reports decided to see just how much performance is impacted when diesel-powered Volkswagen vehicles are in their “cheat mode” by putting a 2011 Jetta Sportwagen TDI and 2015 Volkswagen Jetta TDI to the test. To put the vehicles into cheat mode, the publication pushed the gas pedal five times with the ignition in the on position. To avoid being kicked out of the cheat mode when the cars’ rear wheels start spinning, Consumer Reports unplugged the rear wheel speed sensors.

SEE ALSO: Most Diesel Cars Emit More Emissions Than Legal Limit: Report

From there, the team ran the two vehicles through its drive cycle that involved a city traffic simulation on the track and a 65-mph highway run. Fuel economy figures were calculated by taking fuel readings from a flow meter and averaging mpg in both directions to account for grades and wind speed. The tests were also ran several times in typical Consumer Reports fashion with different drivers to guarantee consistency.

The results? With the 2011 Jetta Sportwagen TDI, acceleration from 0-60 mph went from 9.9 to 10.5 seconds. Fuel economy dropped from 50 mpg to 46 mpg while the 2015 Jetta TDI saw a loss of three mpg from 53 to 50.

It’s unclear if Volkswagen’s fix will just simply put its diesel vehicles in cheat mode at all times, although that’s very unlikely. It seems like the worst case scenario would be about a 10-percent loss in fuel economy, but until the German automaker announces a fix, nothing is definite.

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Discuss this story on our Volkswagen Forum

  • eddieo

    VW should be forced to buy them all back AND pay environmental fines. If it kills the company, so be it.

  • johnls39 .

    So if Consumer Reports says is true about the cheat mode on the effective models is not that much significant from potential repaired models, except somewhat on the older models, VW cheated for nothing in return of massive fines and penalties. (somewhat LMAO!)

  • craigcole

    Not as bad as I thought, but still, what a horrible situation VW put itself in.

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  • Mike Gordon

    I’m not trying to defend VW, but I’m willing to bet a week’s paycheck that their latest diesel cars still pollute considerably less than the millions of 10-20 year-old beaters we see on our roads today, and this is true regardless if the VW is in cheater mode or not.

  • sean t

    Compare a new car against 10-20 yo one? Again!
    They cheat! They should not even think of it.
    Das betrug Auto.

  • Crownie Royal

    Yes, because all of the people who would lose their jobs makes it worth it.

  • eddieo

    Thats what dope dealers say about legalizing marijuana, or coal companies about closing coal fired plants, or what mercenaries say about war – in other words it is a non-argument.

  • Crownie Royal