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I tossed my two autos, with instant fuel mileage bar graphs, in neutral and the Altima maxes the bar at 60 MPG at 16 MPH. The Insight maxes the bar at 150 MPG at 16 MPH. Both were coasting in neutral.
Works out to about .25 GPH for the Altima and .11 GPH for the Insight. Those are consumption when coasting with engine on in neutral. The Insight was rather harsh when you went back into gear and required some rev matching. The Altima was completely different. It seems like it does not engage the torque converter until you give it some gas, you can shift into gear at any speed (have done it up to 80 MPH) and the revs stay very low until you give it some gas, probably no torque converter lockup. The car does lock up the converter very quickly normally at about 12 MPH.
regards
Mech
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