Does resetting consumption on MFD show mpg improvement?

How could lifetime mpg be greater than per tank mpg, unless your mileage is steadily dropping? That makes no sense mathematically. Obviously some tank averages will be better than your lifetime average, and some will be worse. As the total miles accumulate, you will see less and less change in your lifetime average for each tank. This is also simple mathematics: each tank makes a smaller percentage contribution to the total.

Tom

 

I reset the mfd at each fillup and use a spreadsheet that calculates a weighted average of all my tanks.

 

Sandi, the reason the mpg is stuck is 2300 miles of data that created the 43.2. I am at 40000 and reset with every fill-up. In the first 100 miles I can cause the mpg to increase with a little hypermiling, but it has almost no affect when I reach 200 to 300 miles. Most would say to use it to judge how well you are doing on each tank and it also helps point out little problems that arise and affect your miles per gallon.
Enjoy, Jerry

 

Nitrogen won't help. Do it if you want, but don't pay anything extra for it. Higher pressure will help, whether Nitrogen or air.

Tom

 

>I even tried drafting

dangerous.
thats a good way to permanently remove yourself from the gene pool.

 

My 04 resets itself each fill so I can try for a new high score each tank. (well low score here in Australia -.-L/100km)

 

I haven't reset my MFD yet (8 weeks). At first it changed pretty quickly (from 45 when I got the car to about 47) and then slowed down. I was at 47.9 for almost a week going nuts trying to get to 48. A couple weeks later and I'm at 48.2, although I was at 48.3 for a day or so, but made a couple short trips today that bumped me back down 0.1 mpg. I guess I'd rather see lifetime mpg rather than per tank, although it would be cool if the car would show both.

BTW I haven't done anything to my Prius since I got it. I keep meaning to check the tire pressure but haven't managed to do it yet.

 

From what I understand the biggest reason Nitrogen helps is that the tire pressure will be more consistent with temperature differences. I think normal everyday fresh air already has something like 78 % nitrogen.