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Old 06-30-2009, 08:49 AM   #1 (permalink)
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Chug - '96 Volkswagon Polo CL
90 day: 49.42 mpg (US)

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US / Euro mileage calcs

I'm just wondering how the US EPA mileage figures are calculated and how similar the methods are to the way the european ones are figured out. Because Current generation like the VW Jetta seems to get different figures if I convert the Euro MPG (IMP) to MPG (US) and then compare the US number to Our Euros

I've been working in the Auto industry on this side of the pond for years now and I can't see much we've got different in terms of tech. I used to work where they built the saturn's current astra - and they had no mech differences to the Opel astras yet they don't seem to get the mileage over there.... I'm very confused

good things come to those who wait, sh*t turns up pretty much instantly

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Old 06-30-2009, 10:14 AM   #2 (permalink)
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Location: Texas
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PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

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It's a very controlled driving circuit that every car runs on. The Japanese, Euro, and USA circuits are different, so you get different results. In 2008 the US EPA changed the test, which lowered the ratings for all cars.

How Vehicles Are Tested
Detailed Test Information

11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles

Last edited by PaleMelanesian; 06-30-2009 at 10:31 AM..
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Old 06-30-2009, 10:27 AM   #3 (permalink)
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
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I believe that the agerage for each car is derived from some x% city/(100-x)% highway formula. How they get the city and highway numbers s a different story. I've been wanting to look into that lately.

I remember that in the mid '90's auto makers in Poland (and maybe Europe) would give FE numbers for city, 90 km/h and 120 km/h. Then it got changed to city/highway/average, but I've never been able to find what exactly 'highway' means. Is it 90 km/h, 120 km/h, or maybe the average of the two?

e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

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