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 6/10 Very Good --- blogs.cars.com http://feeds.feedburner.com/cars/kickingtires
| The Blog For Car Buyers ... |
Friday, May 09, 2008 --- 77 days ago http://feeds.feedburner.com/~r/cars/kickingtires/~3/286795224/mileage-blog-5.htm
| In Cars.com’s latest Mileage Challenge, we relied mostly on each car’s onboard mileage readout, a feature integrated into the trip computer on many cars these days. Ultimately we chose to use the readouts over our own at-the-pump calculations. In our final installment, we’ve decided to look at just how those readouts work — and more specifically, how accurate they are compared to calculations made at the pump.
Experts were split: Some defended the onboard displays as significantly more accurate than at-the-pump calculations. Another said that the differences tend to even out over time, while another warned that mileage readouts have their own set of potential inaccuracies. So what makes these things tick? Generally speaking, they’re able to gauge instantaneous and cumulative mileage by factoring vehicle speed against how much gas your fuel injectors squirt into the engine. Most run on standardized calibrations, which produce “pretty repeatable and accurate” results, GM’s Terry Connolly said. Connolly is director of the automaker’s North American Energy Center. The systems aren’t always airtight. Ford technology spokeswoman Jennifer LaForce noted that changes in fuel density, which can vary depending on where you fill up, can affect accuracy, as can tire wear or wheel size. As vehicles age, fuel injectors can get dirty, but LaForce and Connolly said even if that happens, internal sensors will keep accurate tabs on the amount of fu ... |
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