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Tried this with my 03 Malibu auto last night and this morning. Only time I could get the scangage to go 9999 so fuel is cut off is downshifting into 2nd while still going 40ish so 2500+ rpm and lots of engine braking. While costing down a long hill this morning couldn't see a much difference between costing in netural or OD watching GPH either way was 0.39 plus or minus 1/100.
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