> Suddenly the big three could have diesel trucks that perform 10% better on fuel economy because California isn't forcing EGR crap down their throats. I can't

> Suddenly the big three could have diesel trucks that perform 10% better on fuel economy because California isn't forcing EGR crap down their throats. I can't find any definitive evidence that exhaust gas recirculation reduces fuel economy, though a sourced statement on wikipedia says there was a 3% drop in fuel economy when EGR was first introduced. Quora[1] also doesn't mention anything about EGR lowering fuel economy. Regardless, environmental regulations are done for a reason. Reducing NOx is a very good thing. [1] https://www.quora.com/Does-the-exhaust-gas-recirculation-system-increase-or-decrease-fuel-economy https://www.quora.com/Does-the-exhaust-gas-recirculation-sys...