That's because it is the mpgs from the time you started your car on this particular trip. Trip A is from the time you reset the trip... same with B.
Did you reset A and B at the same time you started your car? If not, your averages are over different time periods. I have never reset A, and I reset B when filling up. My average for this tank (as showed by trip B) was 68 mph, but my past two trips were "only" 50-60 mpg, which brought trip B's average down to 66. For me, Trip B's mpg is a weighted average of all of my "from start" mpgs (weighted by miles per trip). Pictures of your screens would be helpful, if possible, since we're having trouble understanding what's going on: drive info screen (picture of what it shows for trip A, B, and "from start") Trip A Trip B From start the one that shows instant mpg and 5-minute averages in a blue bar graph
Technically, it doesn't average anything. It simply calculates your mpg based on miles driven vs gallons used since you last reset it. For anyone who uses Trip A to keep track of their tank mileage, you may run into a problem when you bring it in for service. They use the Trip A button when they are re-setting your service oil mileage, so only use Trip B for keeping track of your tank mileage. I learned this the hard way!
Well yes, but I was trying to describe it conceptually, because there seems to be some confusion over what's actually going on. Thanks for the tip about trip A - I'll need to remember to ask them not to reset it, because I use A for overall mpg, EV % and drive time, and I'd like that to stay there. I'll take pictures before just in case.
the dealer told me the from start mpg is from when I bought the car, total overall mpg from mile 1. is that correct?
Your dealer is dumb. Remember this experience if you get a survey from them or Toyota. Though I do wish there was a lifetime mpg/EV miles/EV%/drive time counter, so I wouldn't have to worry about trip A resetting somehow. Does this solve the "from start mpg 20-30" mystery? This whole thread suddenly makes sense - you were confused as to why [what you thought was] the mpg since you owned the car was changing quickly, and was much lower than your trip mpgs. I thought there was some fundamental misunderstanding The dealership could've saved an hour or two of the tech's time (and even more of yours) if their employees would've known (and been able to communicate) a simple bit of fundamental information about the things they're selling...
I would laugh at the dealer and service tech ignorance if it wasn't so painful to the consumer. My service tech told me that I/they COULD NOT mount a license plate on the front of the car! He said there were no such screws and there were no mounting holes... so I guess all of you out there who have plates on the front of your Cs must have used super-glue?
They have to use the Trip A button as part of the sequence to reset the oil mileage. Here is the procedure to reset oil mileage: 1) With the power on, switch to the odometer/trip-meter to display "TRIP A". 2) Power OFF (push the "Power" button). 3) Power ON, while holding the button for toggling between "km/h" and "MPH" 4) You will get a screen showing the reset of the oil change data. 5) When the reset is complete, release the button. They only have to select Trip A to start the sequence, so it shouldn't wipe it out. But, if they hold on too long it may reset. That's why I switched to Trip B for tracking my tank.
To be fair to the dealer, I was asked if (as part of dealer prep) I wanted the holes in the front drilled- they are not made that way at the factory- not all states require mounting the front plate (CA does) and therefore, dealers may offer a choice if someone does not want holes in their bumper unnecessarily. I did ask them to drill- better them than me!
