odie602r wrote:Okay, so with full EGR blank in, is it normal for fuel economy to worsen? On a highway (100kmh) trip yesterday of about 250kms return the MN used almost half a tank.
I haven't refilled just yet to get an exact calculation but mine on a highway normally gets 9ishL/100kms.
I was expecting fuel economy to improve based on reports from here ....
Yes it is. The problem is that with the egr blank in, when the engine operates the egr valve its cuts the clean air supply via the throttle. This produces a notable vacuum in the manifold causing the engine to run inefficiently. I also believe, but can't be sure, that the engine increases the fuel metering in an attempt to counteract this. There are work around for this and the best solution by far is Longrangers mod though it does require a little work to put it in place.
Without any modifications I find my economy is better around town but worse on Highway.