Ok, so the other day I get $25 in Gas and my readout tells me I have 160 +/- miles until empty. I set me odometer to 0 and go on my way... Says I'm getting @ 13.2 mpg at this point. Today, my 50 miles till empty notification goes on and I have only traveled 75 +/- miles. (=125 miles total +/-)

According to my initial readings I should have about 110 miles on my odometer when my 50 mile warning comes on... What gives? I did warm my truck up a couple of mornings just to get the heat up for my daughter... would this effect it? Input appreciated... I somehow lost about 35 miles...
Thanks,
Steve

 

Winter gas.

 

Really... That would do that? I know I get worse mileage in the winter because of winter gas.

Does the tank base it's estimate on how full it gets(physically), and then the 'truth comes out' as it is used...?

With summer gas is it more accurate?

Thanks.

 

I have never seen a "miles to empty" indicator be correct...

 

Me either, never used them in vehicles that had it.

 

I have noticed that the mpg feature on my Gryphon decreases at a horrific rate during extended stops. I have seen the mpg drop as much as 4-5 mpg while sitting at idle for as little as 2 or 3 minutes.
My wife's Toyota Highlander doesn't seem to give a dang if it sits at idle for 15 minutes- still shows great mpg and no change for the sitting.
Must be a truck engine thing.

 

Your miles to empty calc is only as good as the "current MPG" you are getting at that moment of the calc. As your MPG changes constantly while driving, so does the MTE. The calculations have zero idea what you will be doing 10 minutes after the calcs are made. Idling to "heat up truck" will kill your milage and the calcs, as a result.

It will only be somewhat close if you maintain constant speed / MPG between fillups, which we all know, doesn't happen.

 

all that stuff is horribly innacurate. if you reset the avg mpg thing while moving it will be much better than if you reset it before you start driving. idling takes the mpg way down and it really shouldnt. fill it all the way up, when the pump shuts off dont stuff any more in there, then reset your trip meter. then drive as you would normally, go back to a gas station (preferably the same one) and fill it, again not hitting the trigger anymore after it shuts off. trip meter devided by the gallons you put in. thats your real every day no BS mpg number.

sometimes i wish i didnt have that dte or mpg stuff. what bugs me even more is that when my gas light comes on for low fuel i usually have another 7-8 gallons.

if your getting bad mpg, its probably the tank of fuel you got being a winter mix or something

 

The truck takes the amount of fuel it is reading from the sender in the tank, divides it by some snapshot MPG and figures out what it assumes to be MTE. If you are burning fuel by idling the computer off course your MPG is going to be assumed to be lower, because you are getting 0 mpg.

You get 15 mpg, you drive 60 miles on the highway at a steady speed, you burn 4 gallons of gas, you have 20 gallons left in the tank. the computer says you have 300 miles DTE.

You get 15 MPG, you drive 60 miles, then let the truck idle for 30 minutes, which burns a gallon of fuel. You have burned 5 gallons of gas, giving you 12 MPG, there are 19 gallons left in the tank. 19 times 12 is 228 miles to empty.





it is a calculation based on data averaging.


There are lies, damn lies, and statistics.