New engine MPG

[Kitt]

What I'm trying to state is:
1. Both cars ('05 and '15) have a 11 gallon tank and a 2nz-fe - 1.3l engine.
2. I can drive 435.1km (270 mi) with my '05 and 253.9km (157.7mi) with my '15 yaris.
3. My dealer says it is normal since the engine is in a break-in period, but after that it should give me a better fuel consumption.

That said, is this true?

[NYC-SE]

Originally Posted by Kitt

What I'm trying to state is:
1. Both cars ('05 and '15) have a 11 gallon tank and a 2nz-fe - 1.3l engine.
2. I can drive 435.1km (270 mi) with my '05 and 253.9km (157.7mi) with my '15 yaris.
3. My dealer says it is normal since the engine is in a break-in period, but after that it should give me a better fuel consumption.

That said, is this true?

At first glance BOTH these numbers look low but in fact they really tell us very little. Until we know, EXACTLY, how many gallons of fuel were burned to go those 157 or 270 miles we can not make valid comparisons. Perhaps you're simply filling up the '15 sooner, maybe the gas gauge is not accurate, and you think it is empty when in fact it is half full, etc.

It is true that a new engine will burn a LITTLE more fuel during break-in, but the mileage numbers and range that you are reporting are very, very low. In fact they are so low that I immediately question the accuracy of the data. I am not calling you a liar, I am simply saying that these numbers have not been placed in their proper context. A car that was showing those numbers would almost certainly be displaying other signs of trouble. Yet you say it is performing normally in all other aspects, no check engine light, no rough running, etc. Correct?

The only other thing I can think of that would result in the numbers you are showing without any other performance issues would be if someone was siphoning gas out of your tank.

Do like Toyota suggested, track it over a few months and see. Make sure to use the exact amount of fuel added at the pump in your calculations. Don't guesstimate.

P.S. If anything I would expect the 1.3 engine to be more fuel efficient than the 1.5

[Kar98]

Originally Posted by NYC-SE

P.S. If anything I would expect the 1.3 engine to be more fuel efficient than the 1.5

Dunno about that. My wife has that 1.33 engine in her Scion and it gets a couple mpg less than my Yaris. Her car is smaller, but also has the CVT.

[NYC-SE]

Originally Posted by Kar98

Dunno about that. My wife has that 1.33 engine in her Scion and it gets a couple mpg less than my Yaris. Her car is smaller, but also has the CVT.

I think in the IQ the aerodynamics also come into play. Anyway I have no hard data on FE vis-à-vis 1.5 vs. 1.3, was just my gut feeling. I would think that in the same car the 1.3 would be slightly more efficient than the 1.5, all other things being equal.

[Kitt]

Originally Posted by NYC-SE

At first glance BOTH these numbers look low but in fact they really tell us very little. Until we know, EXACTLY, how many gallons of fuel were burned to go those 157 or 270 miles we can not make valid comparisons. Perhaps you're simply filling up the '15 sooner, maybe the gas gauge is not accurate, and you think it is empty when in fact it is half full, etc.

It is true that a new engine will burn a LITTLE more fuel during break-in, but the mileage numbers and range that you are reporting are very, very low. In fact they are so low that I immediately question the accuracy of the data. I am not calling you a liar, I am simply saying that these numbers have not been placed in their proper context. A car that was showing those numbers would almost certainly be displaying other signs of trouble. Yet you say it is performing normally in all other aspects, no check engine light, no rough running, etc. Correct?

The only other thing I can think of that would result in the numbers you are showing without any other performance issues would be if someone was siphoning gas out of your tank.

Do like Toyota suggested, track it over a few months and see. Make sure to use the exact amount of fuel added at the pump in your calculations. Don't guesstimate.

P.S. If anything I would expect the 1.3 engine to be more fuel efficient than the 1.5

ok, so next fill up i will write down the odometer reading and will do the math with the reading on the next fillup and keep you guys posted. I will also write down the reading on the pump and I will do my best to use the same one, so I can get the numbers as accurate as possile.