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Running the first tank now but did do a small test of mpg. I have several places marked out around Atlanta that I have noted pure hwy mpg with cruise @55. This stretch is mainly flat with a couple of small hills. Without the block it got 41.6 mpg.
With the block it got 45 mpg.
Going to test a couple other stretches I have mapped out to see what happens.
The temp is still staying low and only comes up a few degrees if I sit idling (yes, I know).
The AIT is up quite a bit. Without the block it would stay 15-18F above ambient on the highway. With the block it stays 40f + above ambient. I think this is due to the heat soak from the motor heating the airbox up more than anything. There is a gap in the middle half of the block at the hood that is where the intake port is located so it should be getting some cool air.
On the cars instant mpg gauge at 55 on cruise it would peak out at the crest of hills and with the block it does this a bit sooner than the crest.
Everything is saying it is getting better mpg but after 10 tanks or so we will see.
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