I can give you an example:The mileage is not so erratic to explain such extreme differences.
- Fill up and drive like I do normally around town until I have 1/4 tank left. After I fill up, my DTE is over 500.
- Right after I fill up, I take a trip down to Chicago. Doing between 80-85mph and very windy, half of the trip against the wind. During that trip, my MPG drops to 31. Next time I fill up my DTE will not be over 500. It’s also happened after towing, doing over 75mph.
I have done 34 tank fill ups. I log every single one of them. Every time the tank has been full. How do I know? Because I top it off every single time until nothing else can be pumped in and the needle is well above the “F”.
The DTE on our 2016 Hybrid fluctuates the same way. It did the same on our 2012 Venza.