Q:Why don't cars get better gas mileage these days, given all of the computer controls? Isn't the point [of those controls] to maximize efficiency? -Bruce N., Plymouth
A:Compared to carbureted cars of old, today's computer-controlled cars are much more precise, able to adjust air-fuel mix and engine timing according to conditions. This control does keep the engine operating more efficiently for better power and fuel economy.
All things being equal, those controls applied to older cars would make them more efficient. But compared to yesterday's fuel-efficient cars, such as a 1980 Toyota Corolla or Datsun B210, today's cars are much heavier. Modern cars also have comparatively high horsepower compared to past vehicles.
Open the hood on a Corolla from 1978 and one from 2008 and witness the extra "stuff." All of those controls that are fine-tuning engine performance and reducing emissions add weight. So does all the safety equipment - airbags, ABS and stability control, with all of its supporting components. Luxury items also add weight. Heated, multi-position memory electric seats weigh more than an older car's simple buckets. Lots of extra electronic components for luxury items add more pounds.
The high-horsepower issue is also significant. The most fuel-efficient cars of old did not have 125-plus horsepower, a figure common today. Keeping with our Corolla example, the 2008 model has 126 horsepower and weighs about 2,530 pounds. The 1978 version had 55 to 75 horsepower and weighed about 400 hundred pounds less. Producing 70 percent to 130 percent more horsepower and moving 20 percent more weight takes back gains made by increased operating efficiency derived from computer controls.
Q:I have a 1964 Triumph TR4 that is stored most of the year in a heated garage. Is it a good idea to cover this car, or do covers trap moisture and lead to problems? -Bill S., Anoka
A:A cover would be a good idea. The moisture-trapping idea you're talking about derives from old-style "cover" approaches like throwing a big plastic tarp over an old car in the driveway. Plastic doesn't breathe, so as rain and snow fall and evaporate around the vehicle and humidity rises and falls, an air-impermeable tarp can hold moisture in and provide inadequate protection. Car-cover science has come a long way since a plastic tarp was the protection of choice. Modern tarps will not only breathe but can also provide padding in case someone knocks a rake over or decides to set something on your Triumph. In addition, your temperature-controlled garage will diminish ill effects from big temperature and humidity swings.
There are many companies manufacturing and selling car covers and their websites should list the specs. Generally speaking, price relates to quality. Personally, I'd go with a fitted cover designed for your TR4. This will assure a close and proper fit so ends aren't hanging on the floor to get dirty or caught on things you or family members carry past the car. Fitted covers also look nice, for what that's worth - some people enjoy a neat look to their garage. Covers have different weights, prices and offer different sorts of protection, so read carefully for one that best suits your needs. Some Internet searches like "car cover review" will get you started.
