96 Nissan 200SX SE-R with SR20DE motor

[camshaft2005]

So I am thinking about buying this 1996 Nissan 200SX SE-R, but I am a little confused about what this guy is saying about it. I have looked up the Nissan specs and with the stock motor its supposed to get around 31-33 mpg. This guy is saying "The motor he replaced it with is a newer generation SR20DE which is more efficient then the stock engine which means better mpg and more performance" I expect the better performance, but my friend read somewhere that the SR20DR actually decreases the mpg. Though supposedly he was able to get 40 mpg on a long trip up the Oregon coast. Is he telling the truth or is that much of the story BS? What kind of mileage should I expect out of this car?

[RED_DET]

The mileage shouldn't change if he replaced it with another SR20DE motor. It may increase by 1mpg or so, because it may run more efficiently because it is a new motor with less mileage. Nothing else special about it though.

[nametakennow]

New version out of what car? If it's the roller-rocker SR, he might see a little better mileage, but it's probably mostly due to having fewer miles and probably in a better state of tune.