Dave (NatureBitz),
I'm towing a 2922KB with a current generation Highlander V6 and have observed 15 MPG as an average with just a little over 17MPG for a high while towing.
The highest MPG I've gotten while towing occurred, ironically, at moderate altitudes/ grades due to being in somewhat congested highway conditions. It seems with the V6 ICE I get the very best mileage with little stopping and keeping speeds below 65 MPH.
My MPG drops more from stop and go traffic (like you get on secondary state highway segments) than driving a more or less constant 65-75 MPH speed on federal highways.
Since you benefit from regenerative braking and electric motors at start, I wonder if that stopped/ started scenario will be where you see your best mileage.
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 Rich and Lynn: 2021 2922KB
420Ah LiFePO4 battery bank, kilowatt solar, 3K Watt Pure Sine Wave Inverter, DC-to-DC Charger, Sealand 711-M28 toilet, Maxxis 8008 Load Rated E
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