Well I never measured my mpg before but lately i became intersted in it because it seemed like it became lower. The way I calculate it is I fill up and set the trip to 0 then the next time I fill up I take the gallons that the pump filled in (obviously i dont pull up to the gas station on empty, 14,5) then I look at the amount of miles on the trip and take that and devide by how much the gas station filled up. And I ve been coming up with 23. Is that the average for our car? or should I be worried about that there is something wrong with my car.

The driving I do is mixed, some highway some city type, I usually shift between 2500 - 3000.

 

fill up until the nozzle clicks off. don't add any more. record the number of miles until the next fill up. At this next fill up, fill until the nozzle clicks off. Record the number of gallons it took for the nozzle to click off. miles/gallons. 23 is what i get strickly city driving. these 5 speeds rev pretty high on the highway. try to stick to 70 mph to increase the highway mileage.

 

could the fact that its been really cold out have an effect?

 

Yea, you're calculating it the right way. 23mpg is the same avg I get which is about right with the rated mpg of 22/29. You have nothing to worry about, it's because of our "sporty" gearing.

 

This is how I do my calculations as well. I tend to get around 25ish miles per gallon on average. I check it every time I fill up and write the mileage down on my reciept that also has the total gallons pumped, total price, and price per gallon. Then, I put that into a spreadsheet once I get enough reciepts in my arm rest. Yea, I am a geek, but it is interesting to see how it fluctuates.

 

Yep. Winter gas gives you worse MPG. Also, idling while waiting for yout car to warm up hurts a little.

I use the same method to calculate my MPG, and I generally go to the same station and same pump.

A better way of calculating MPG would be long-term, to compensate for any differences in the amount of gas that a pump puts in your system. Just keep track of total miles, and total gallons spent.

 

I thought my mileage seemed low, but when calculating i seem to be getting 26 miles per gallon when i fill up 10 gallons of gas. I had heard that the tank is a little over 11.5 gallons.

 

the xB tank is 11.9 gallons. I calculate my mileage the same way after each fill-up and average about 29-32, but that is interstate driving no faster than 75mph. Any faster than that it drops to about 26-29. The xB five speed is extremely high revving as well.

 

I've averaged just a little under 36 mpg for the first 20,000 miles. I have a five speed and drive mostly locally. Usually shift up aroung 3000 to 3200 rpm. Top speed is usually about 60 mph. Your mileage seems awfully low to me.

 

http://www.gasbuddy.com/

You can use something like this. They have a mileage calculator which is good because you dont have to worry about where you lost the list after every fill up. I know its easy to do but its easier to track over time if its all written down in 1 place where you cant lose it. It also has local gas prices so you can see where to go and where not to go.[/url]

 

go to gas prices,com it keeps track of your fill ups

 

guys let me interject a thought here that might explain alot of things first I own an Xa so I don't know about other models mine is a 2006. I pulled out the spark plugs at just 208 miles wow they had carbon buildup already and smelled like gas on a totally stock engine I've been a mechanic for ten years this is a clear indication that the car is running rich. this would explain peoples posts about poor mileage and failure of sensors,carbon buildup,and other emmissions components problems, so lets now adress this problem the gap on my plug and my mothers plugs in her XA was 26 thousands on denso factory plugs this is way to small of a gap in fact if you upgrade to iridium denso plugs for the Xa they are gaped at 44 thousanths alot larger. so I started reserching the scions and they call for plugs gaped at 44 thousanths but anything you buy from the dealership is gaped at 26 thousandths. So here is your solution either regap your factory plugs or buy iridiums. since I have changed to iridiums I am getting 46 miles to the gallon in the city and 52 miles per gallon on the highway I have also noticed a tremendous increase in power and acceleration. the only reason I can speculate for the dealership to put in plugs with the wrong spark plug gap is it will cause parts to fail over time most likely after your warranty has run out thus ensuring that you'll be stuck buying expensive parts and keeping the repair shop busy for years to come. the cars are very inexpensive to purchase my feelings are they have to make up the money some way check the gap on your plugs yourself go to your local autozone pull out a denso book and look at the gap specifications that are recomended for our cars you will see I am right. I hope this reply helps alot of scion owners achive the performance and reliablity and gas mileage that our cars are totally capable of and being deprived of. why I don't know but I do know my local dealers says to buy a manual on the car will cost 400 dollars an in depth repair manual and I find this strange considering the cars have been around so long in japan. I also would like to take a moment for people to ponder aftermarket intakes The mass air flow sensor is built into our airboxes it looks non removable are people sacraficing their mass airflow sensor for an intake this may be another answer to alot of peoples gas mileage problems I have seen the water prevention valves cause loss of power on the dyno on other cars and I am skeptical of any cold air intake that has the ability to pick up water I have seen many engines ruined. I will do a comparison in the near future of just a K&N filter in a stock airbox versus a cold air intake even if it means removing the airbox with the mass air flow for testing. I think because the way the car is desighned in this case the k&N with a properly working mass air will outpeform a cold air intake and will keep the reliablity of the car look for this soon. I may be wrong and these kits may provide a way to mount the mass air flow sensor but if it doesn't people are playing with fire and setting their cars up for disaster and high maintanence. But the intake is not my reason for this post my post right now is based on pure fact that the gap on the factory spark plugs are wrong and people's cars are suffering bigtime because of it. This car has alot of hidden unfound power and I will be digging it out like I've done on many cars over the years and posting how too's and dyno results but please go to autozone verify what I am saying is true on your plugs take a plug from your car check the gap then check the gap on the iridium replacement and see what denso and ngk recomend for your gap 44 thousandths that is a huge jump from what the dealership has them set at if you have any questions please feel free to ask me. I'm sure somone here who works for a dealer is going to try to discredit this so your parts can break and you have to spend lots of money fixing your car so please go verify it yourself if you are a scion owner you owe it to your car and to your wallet at the gas pump and you will thank me for saving you money on all those replacement parts and thank me for oyur gains in power and gas mileage.