Fuel Mileage booster’s

mpgmike said

Back in 2008 I looked at the fuel economy rating for various world cars like Subaru Legacy, Toyota Camry, and such; I checked US, NZ/AU, and Europe. Some cars got 20% better economy in other world markets over the US. The stark difference was the VW Jetta Diesel; 43 MPG US and 72 MPG NZ/AU! Tried looking again recently, but I couldn't find the economy numbers very easily. Odd since that's something on everyone's mind.

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i figured alot of that came down to NOx regulations. If you have a hotter cylinder combustion (e.g. leaner/more complete burn) efficiency goes up.. but so does NOx. For some reason i thought most of europe had looser emissions than US and certainly CARB. Higher gas prices for sure, but looser emissions standards.

Fun fact only tangential to NOX: the down stream o2 sensor (might be 10years out of date IDK) thinks your cat is not working if it cannot detect a o2 changes before and after the catalytic. In other words if there ISNT raw fuel in the exhaust it will throw an emissions code.

Get your calculators out. When gas was almost this high ~2008 e0 100% gasoline was worth ~$0.30/gal over E10 common in my area at the time, now almost ubiquitous.