egr is meant to help by reducing pumping losses by lowering vacuam in the inlet ive played around a lot with egr and it doesnt really help at all for saving fuel mostly emissions.ive turboed a lot of non turbo cars and they get better MPG at cruise even without boost.the gain in torque at 100kpa is huge on turbo conversions but the whole cruise map is up in torque and you use less TPS to move the car at the same speed