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OK First I have a 2000 Mercury Grand Marques more or less stock and I can get 27/30MPG if I stay under 70 MPH and 24/26 around 80/85 MPH high way.
I am running a 99 P71 CPU, and "stock sized" tire and rim to 18 inch wheels and tires...(same size as original)
And I can get it to do 34/35 MPG under 70MPH IF I can stand running 16.7 to 1 Air fuel ratio..but it does lose a lot of power doing that.
So far I have not figured a way to do that FR automatically so it is a pain to set it up and to return it to stock.
Question is there any newer 6 speed autos that will fit behind the 4.6??
OR better yet either a second Over Drive or two speed rear end giving it 8 speeds?
Rich
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