low mpg

eco mode or normal mode make no difference, read your o/m and don't listen to the dealer. i think you're fine. put some miles on her and chillax.

 

Prius MAX MPG Secrets
Michelin Defender 38/36(psi) eco mode
2011 Prius L | PriusChat

 

Don't worry about it. Filling neck to neck takes more than a couple refills to get a reliable average. Some forecourts are on a slope giving false readings. Just use the cars computer and minus 5% to get a pretty good average. Also, the Prius takes until about 5,000 miles (8,000 km) before the car is bedded in and more able to get its best economy readings.

Try it in 'normal' mode rather than Eco.

 

If that means that you put gas in it until you can SEE it in the filler neck, that is TOO MUCH.
Continuing to do that can plug up some of the emission control systems and make it run really bad.

 

Very short trips will kill mileage. Like any other ICE car the first minute after a cold start is extremely inefficient.
The shorter the trip, the greater the portion of the trip was done cold.
Additionally the colder the weather the worse this will be.

The key here is that your Prius will still manage to do much better than any conventional car with the same driving cycle. But it can't perform magic.
You can reduce this effect a little by installing an engine block heater but it might not actually pay for itself in the foreseeable future.

 

The OP lives in SriLanka. An engine block heater would be no use at all.

 

It's not necessary to fill to the neck to accurately track/calculate your mileage. Personally, I fill 'till the pump shuts off. Note the odometer reading, note the fuel added. Drive 'till tank is getting low. Repeat. The calculation of single tank will may be slightly off, due to vagaries of the pump's shut-off mechanism. That will reciprocate on the subsequent fill up. And when you calculate accumulating tanks, the error is nil.

 

what time is it in sri lanka?

 

It's mid afternoon here in the UK so I'm guessing mid evening in Sri Lanka.

 

thanks, o/p must be out on the town.

 

It should definitely help

 

thanks, that should help a bit, but i think your biggest problem is your data recording.

 

no, not that much, but as someone mentioned above, what is your overall lifetime average?

 

That's 20.7 mpg US.
That's pretty bad.

 

It's not bad, it's bordering on unbelievable.

We had another poster from SriLanka about a month ago saying they were also getting similar mpg's. It just doesn't sound right even in heavy traffic. The warm weather is ideal for the hybrid system. In the cold UK I would average high 40's/low 50's mpg UK with average road speeds of 12 mph over a 10 hour shift.

I don't buy someone getting 20 mpg.

 

is that 21 mpg? can anyone decipher the o/p's first post regarding city traffic? it doesn't sound heavy, slow or stop and go to me. what does '363km, average speed is 45km is very short distance' mean?