Driving from Phoenix to San Diego I got 375 on a tank, 13.5 to fill and that was with a lot of 100-120mph driving. I tried the whole drafting thing...and decided not to do it when I saw my brand new CF hood start bouncing all over the place.

 

city i get horrible mileage. Washington dc owns me.
but highway. close to the 400 mark.

I started to avg my gas. so ill let yall know after six months from now,

 

This ^^ is KEY !!!!!! I cannot stress it enough!

Also, some other tricks of the trade(not sure if already noted before) :

*Use gravity(when going downhill) to your benifit. Keep car in gear, take foot off accellerator(gas cut off will stop delivery of gas to engine) , yet you will still maintain a good speed for X amount of yards/miles.

*Use Momentum, like its your friend. For example, when knowing your approaching a intersection stop/signal , take your foot off the gas when the time is right, and coast/ down shift when coming into the intersection (don't just keep your foot on the gas until 100 feet before the stop sign

*Use Synthetic oils(engine/ tranny).

*Proper tire pressure, at all times. Lighter/light wheels are also nice to have.

*If you know your going to be in your car/stopped for 1+ minutes, shut off your engine, then restart later. Sitting at idle, for over a minute EATS gas

*If you dont NEED your AC to be on, SHUT it off , it EATS gas.

*Keep windows rolled up as often as possible when driving(an aero thing).

.... just a few tid-bits of info .....

 

I did the exact opposite just about every day while I was living in AZ. I knew it would result in crappy milage, but A/C is a must, and I love open air driving But yeah, everything you said is 100% dead on. Especially tire pressure, low pressure = floppy tires = more traction = less mpg. high pressure = firm tires = less traction = more mpg. However you don't want to go overboard with it and cause damage to the tire with poor wear, the car calls for 32F/29R, I'd say most you should go is 35/32. Anything more will just result in too much wear on the center of the tire.

 

i only get like 260 a tank. is that bad?

 

Are you suggesting that your A/C actually controls the local weather? Brings a whole new meaning to the term, "climate control".

 

az weather right now is awesome. other than the storm we are having right now. however it should be like 70s tomorrow.

i drive wit my windows down when its either hot or cold, wit the a/c or heat on to make it feel just right. and do not notice my gas mileage going down

 

Haha, I meant crappy milage .

 

It seems to me that one thing that has not been mentioned is the octane of the fuel. Just my experience here in AZ. I bought my car with a full tank and got 370 out of it. I drove for about a year and got anywhere from 330 to 345 using mid grade fuel. It never mattered too much if I used the a/c or not. When the prices were at their highest this year, I filled up with the cheap stuff, I only got 310 miles. My thought was if cheap stuff get me 20+ miles less than the mid grade than if I use premium I should get 20+ over the mid grade. My last 2 tanks were filled with premium and the first one was 368 miles the second one was 355. I am seeing the same or about the same as my first tank full. I have a completely stock 07 tC. I have nearly 22,000 miles on it and only replaced the air filter one time. I checked it with every oil change and it wasn't bad.

Rich

 

cant you mess up the injectors if you put to rich of a fuel in your car??

 

yea, on very cold winter days, I go thru a full tank in a week pretty fast just by warming my engine up for 5mins before my commute to my job, before going out to lunch, & getting back home. Gas stations here in the midwest are suppose to change the formulation during this time. I'm getting terrible gas mileage right now compared to mileage I got out of during the summertime. And driving on unplowed streets and spinning your tires in the snow in stop n' go traffic just to get the car going sure doesn't help gas mileage too.

 

No, the only difference between 87 and 93 and 12387123891273 octane is the resistance to detonation. Any over 87 octane in a tC is a complete waste, unless you're boosted or running high compression pistons.

 

I usually get about 350 a tank, sometimes more, for highway driving. Thats on about 12.5 gallons or less.

 

Just curious, if anything over 87 is a waste, then why do I get much better mileage with higher octane? If you take the cost of lowest to highest octane there is a $0.20 difference. On a 13 gal fill up that is $2.60 more that I spend. I get about 50 more miles more from the premium than I do out of the cheap stuff. At our average that is about 2 gallons of the cheap stuff to get that mileage back. That would cost nearly $6.00 at the current price. My spending $2.60 more today saves me $3.40 tomorrow, by that math.
Higher octane burns slower than lower octane. It is not only important if you are supercharged, turbocharged, high compression, or use nitrous. If your fuel is burned up and no longer expanding BEFORE the piston is at the bottom of the power stroke your efficiency is wasted. Therefore more fuel will be needed to create the same power/torque and get the car moving. That wastes fuel and lowers mileage.

Rich

 

All Scion cars call for 87 octane. I would not put in 89+ , as it would be a waste of $.
If you have a supercharged/ or turbo'ed tC , then you gotta put 91+ octane in for it to run right = more $$ out of your wallet/purse

Save that added $ on gas octane, and put in synthetic oil and/or a oil additive treatment(like for high-milage cars) = that will help protect your seals for the long term engine care.

**Dont forget, the wider the tire you have on there(ie. for tC owners stock is a 215 , so in going to a 225+ its more friction on the ground/surface = more friction = less mpg ) , the worse your mpg is going to be. So .... for us xA / xB owners, sticking with a 185 or 195 width is gonna be the best width tire for mpg (195 is especially nice, since its a little wider/ more secure when cornering , yet many users of 195's haven't noticed a real mpg decline vs. 185

 

the most i've gotten was 330, and that was EMPTY! i put in 14.2gal

 

not entirely true.
wider tire = better traction = less freewheeling = lower rpms = increase gas mileage.

 

last week i got 404.7 miles to the tank!! about 90% freeway driving, avg speed about 80 mph..

 

If tire psi was low then it will drop mpg. having a thinner tire profile has more to do with overall traction. you won't believe this, but a 185 tire size has better traction in the rain or snow than a 205 tire size. wider tires in the wet slippery streets is more prone to hydroplaning. But on a dry 75 degree temp day, it goes the other way around.



now back on topic, most mpg i got was 350 in the spring

 

City Driving Avg: 280mpg

Highway Driving Avg: 320mpg

Best: 398mpg and the little light had not yet come on when I refueled.

Icy roads make for slower speeds
But better mpg, when crossing Wyoming