VW Golf TDI Case Study 4 mpg more Proof in the Pudding

Achieving mileage of over 50 mpg for the first time is consistent with results reported by other Test Team Members driving similar cars.

Ever wonder what the statement, “The proof in the pudding,” means.  An odd statement, since pudding is no longer on the menu of most, let alone the best of restaurants. What “The proof is in the pudding” means is that no judgment can be made until you try the product.

In How to Prove GasPods Work To Save Fuel and “Wind Tunnel Tests, Black Holes and GasPods,” we shared results from the computer fluid dynamic analysis of GasPods placed on a Volkswagen Golf Body. 8 days and 4.5 hours of computer crunching revealed a 5.2% – 6.7% reduction in the drag coefficient of the vehicle. That is huge!

No one will argue against the fact that decreasing the drag coefficient lessens the load on the engine, and thereby increases its fuel efficiency. The question is, how much? Since many variables affect fuel consumption, it is almost impossible to calculate fuel savings from drag reduction alone.

One of the 3 researchers, who signed off compliance of the study with industry standards, a Ph.D. aeronautical engineer gave an educated shot at it. He mathematically predicted 1.3 mpg savings from enhancing the car’s aerodynamic efficiency with GasPods, placed as tested. Coincidentally (since we, not he, chose the car body to use in the initial study), he commutes to and from work in a Volkswagen Golf TDI. The Golf TDI has the same car body as that used in the CFD study.

TDI is an acronym for “Turbocharged Direct Injection,” which according to Volkswagen is “an innovative engine design that delivers a combination of performance, fuel economy, and low emissions….”

On the intake side of the equation, all TDI engines use a computer-controlled injection system that sprays fuel directly into the combustion chamber at very high pressures that help promote more complete combustion.”  Aerodynamics, which GasPods address, is one way in which the auto industry is striving to increase the fuel efficiency of vehicles. Engine performance, which TDI Technology addresses, is another.


“I have found that I get the best mileage if I angle the pods a bit (maybe 20 degrees) trailing-edge inwards.”

Even for our aeronautical engineer, the math was not enough. He had faithfully logged mileage since purchasing his Golf TDI. He had a good baseline mileage average off which to embark on his own field study verification of GasPods’ real world worth.

The results: “I’ve had the GasPods on my Golf TDI for almost a year, and am seeing close to a 4 mpg improvement over the fuel consumption I had without. This is a little bit better than the CFD analysis we did for you a few years ago.”

scangauage_0015He also has on his dashboard a programmable on-board diagnostic (OBD) system. The Scanguage II hooks into the OBD interface and displays information from the engine management computer, including real-time data about a vehicle’s instant and average fuel economy, fuel used, cost of fuel used for each trip, cost per mile, gallons per hour and more!

AeroHance Test Team Members are real world drivers. Clients who provide a minimum 2,000 miles of odometer mileage and gallons consumed, of gas, diesel, or ???

Since GasPods affect the aerodynamic characteristics of the vehicle body, they work similarly well no matter the type of engine or fuel consumed.

Test Team Members then provide the same after GasPods have been installed.Test Team Members provide the proof for themselves, and allow us to share their desert with you!

 Prove To Yourself

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