Multiple Gas Issues

The Gen 2 Prius has a rubber bladder in the gas tank. In the Winter cold it does not stretch out to it's full capacity. Age might also have something to do with it's flexibility. I imagine you will just have to live with the problem.

 

what he said ^^^ if your mpg's are good, there's nothing else wrong. you can try different gas pumps, pump very slowly, try turning the nozzle sideways and open the gas cap and let it breathe for a minute.

did you get a new hybrid battery under warranty?

 

I would say like the other's above, 98% of the problem is the "aging" bladder. Gen II Prius is well known for it's issues with the bladder that worsens over time. FWIW, Gen III and Gen IV does not have the bladder. Gen III began with the 2010 year model. Gen IV was just released this year. I am referring to standard Prius and NOT the newer v series (station wagon) or the even newer C series (sort of compact Prius). The information in this paragraph is referring to your "volume" problem, whereas the following paragraph is suggestions on how to possibly raise your MPG.

There are some other things you could do to possibly raise your MPG. Switch to synthetic oil, pump up your tires to the max on your sidewalls while maintaining a two pound higher pressure on the front tires(make sure they are LRR type), concentrate on P&G and make sure your Prius is aligned and that none of the brakes are dragging.

Best of luck to you.

 

For the MPG issue only, fill out as much of this questionnaire as practical and post the reply here. That will give us more clues to help try to figure out any issues.
Fuel economy complaints/queries? Please copy, paste & answer these questions, esp. if you're new | PriusChat

The gas tank & bladder issues are separate from MPG.

 

you can reset the fuel gauge calibration, see if that helps. there's a thread here somewhere. see posts #2, 3 and 4.

 

Here's mine since Nov
7.75
7.86
6.72
7.53
6.45
7.73
3.36
7.58
7.13
gets much better in Summer