Fuel Economy

[steved]

Just got my yaris lift-back automatic, on June 8, and already filled up four times (do a lot of mileage), and averaging 37-40mpg US, not too aggressive driving and using the a/c sometimes. 80% highway - 20% traffic.

My first tank actually got 30 mpg, all I did to get to 37-40mpg was to fill the car right up to the rim. I've been doing this on my other car (Echo sedan) and been averaging 43-45mpg.

[adamschneider]

Originally Posted by steved

My first tank actually got 30 mpg, all I did to get to 37-40mpg was to fill the car right up to the rim. I've been doing this on my other car (Echo sedan) and been averaging 43-45mpg.

Why would filling the tank higher improve your mileage (unless you're really bad at math)??

[steved]

Originally Posted by adamschneider

Why would filling the tank higher improve your mileage (unless you're really bad at math)??

I can't really tell you, but maybe because most people when they fill up there cars usually stop when it clicks. But after if clicks you can add another gallon approx. to the tank. So that extra gallon adds extra mileage.
What can I tell you, this works for me.

[adamschneider]

Originally Posted by steved

So that extra gallon adds extra mileage.

Umm, no. It adds miles to your "range": how far you can go on a tank. It does absolutely nothing to your miles PER gallon.

[ECHOKnight2000]

Lately I've been getting worse then I usually adverage. I usually adverage during this time of year (summer) mid to upper 40's. Sometimes 50mpg. But as of late I've been getting low 30's and some mid 30's

I did get new tires so I'm guessing it might be that. They are 14inch Michellin Harmony tires? I heard they were good and they are. So I'm guessing since they are new and the tread is not worn it will affect my mileage but even when I take it easy and I usually do my mileage is suffering. I guess I have to give it time when the tires wear in a little more. I know with my last they were getting down there. Anyone have suggestions? Would new tires really effect mileage that much? I know it would but didn't expect that much of a decrease. They handle like a dream and the car is more confident in turns and on the road (still getting use to it) so I guess that's the trade off.

[BailOut]

Originally Posted by steved

I can't really tell you, but maybe because most people when they fill up there cars usually stop when it clicks. But after if clicks you can add another gallon approx. to the tank. So that extra gallon adds extra mileage.
What can I tell you, this works for me.

That does not increase your miles per gallon (MPG), but merely the number of miles you can travel on the tank (the range).

Additionally, the reason for the automatic shut-off at the pumps is to prevent both raw emissions and spillage. Bypassing that system is not helping your local environment one bit, and is illegal in many areas.