My computer is what I use to contact others on the Internet. Not needed in my car.
Even with indirect injection and a boxy body it runs at 50 mpg plus. I have felt that colder air containing more O2 would be more economical than less O2 although cold weather has a myriad of other issues with less air pressure in tires, More electricity needed, thicker lubricants and denser air. Have also read that an intercooler can increase mpg by cooling the intake charge. I have had several turbo cars both gas and diesel but never ran any back to back testing.
I run fuel that is labeled 20% biodiesel and regulated by the federal government. I am not about to put anything bogus that will reduce the life of my engine or car. It has made it nearly 3o years at close to 10,000 miles a year so the VW engineers and designers obviously know something about making an efficient running vehicle.
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Originally Posted by blownoiler
Is your injection system run by a computer? The older mechanical injection systems can benefit from an underbonnet air intake when ambient temps are very low, the computerized systems generally give better results with cooler air, but you can heat the fuel for better mileage if you are running alternative fuel, but I wouldn't suggest that you heat low sulfur diesel as pump/injector wear may be accelerated.
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