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In another thread I asked the question about the fuel cutoff adjustment. The answer I received was since my tps is 0 at idle with a warm engine I was advised to and did adjust the fuel cutoff to 4. After running for some time time I notice the mpg readout occasionally still goes to 9999 mpg when I use downhill grades to my advantage. Should I make any more adjustments?
Goldie

My understanding is that it is supposed to read 9999 when DFCO cuts in, to reflect the fact that no fuel is being used.