Monday, October 29, 2012

Yes, your gas mileage may vary. It's ok.

Fuel economy depends on a slew of factors beyond the make and model of your vehicle, including traffic, driving style, landscape, and even weather. For the real scoop on a car's fuel efficiency, check real world economy websites and see what other drivers have been getting.?

By Antony Ingram,?Guest blogger / October 27, 2012

A message board flashes a warning to drivers on Interstate 10, the Santa Monica Freeway in Los Angeles, to plan for a closure of the Interstate 405 freeway in this September 2012 file photo. Living in a high-traffic area like Los Angeles may reduce your car's gas mileage, but things like landscape and weather can also play a role.

Redd Saxon/AP/File

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Despite best intentions, it's always necessary to take EPA?fuel efficiency?figures with a pinch of salt.

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A look at MPG-recording sites like?Fuelly?or the EPA's own?fueleconomy.gov?website will show that many drivers have wildly varying economy figures.

And that, of course, is why the slogan "Your mileage may vary" came into being.

People have known this for as long as official tests have been carried out. Certainly since the old VW bug, if the advert you see above is to be believed.

Volkswagen has long since been renowned for its self-deprecating advertising style, often implying that its products might not be the best (particularly during the Beetle era), but selling their virtues with brilliant effect.

And while the Beetle might have achieved impressivefuel economy?figures in official testing, VW was more keen to promote the actual figures that real-world driving might result in--in this case, an "honest 25 mpg".

In completely non real-world driving, with a significantly lightened body--and even a jockey behind the wheel to reduce weight, at least for amusement purposes--the Beetle would be capable of up to 84 mpg.

In more recent years, Volkswagen has been on the other side of gas mileage claims. Many drivers in the real world are finding their Volkswagen diesels will achieve?comfortably more than that seen in EPA testing--though no carmaker these days would put its neck on the line and suggest their cars beat official figures... and those that can't even match them are?at risk of getting sued.

Gas mileage depends on far more than just the type of?car?you drive. Regularly encounter lots of heavy, stop-and-go traffic? Expect to see less than even the official city figure (unless you drive a hybrid...). Drive 90 mph on the freeway? Don't expect to match that 40 mpg figure. Regularly do 80 miles a day in your Chevy Volt without a top-up charge in the middle? That combined economy figure will seem harder to hit.

Then there's weather, driving style, and landscape. One-way journeys can look pretty bad on your trip-computer if you've been going up-hill a lot (just as well you'll be on an easy downhill glide in the other direction...).

There's maintenance too--keep those tires pumped up and in good condition, and you'll have your best chance of getting good mileage. And accessory usage--keep aircon and lights to a minimum (safety permitting) and your wallet will benefit. Do the complete opposite, and don't expect to match those window stickers.

So while you're shopping for your next car, take a look around some of the real-world economy websites, and see what other drivers have been getting and on what sort of journeys.

You might just save some gas by buying a model that beats its EPA ratings--or at least, reduce the surprise of a model that doesn't...

The Christian Science Monitor has assembled a diverse group of the best auto bloggers out there. Our guest bloggers are not employed or directed by the Monitor and the views expressed are the bloggers' own, as is responsibility for the content of their blogs. To contact us about a blogger,?click here.?To add or view a comment on a guest blog, please go to the blogger's own site by clicking on the link in the blog description box above.

Source: http://rss.csmonitor.com/~r/feeds/csm/~3/Tg_OaPel7KM/Yes-your-gas-mileage-may-vary.-It-s-ok.

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