mileage getting better

[pxpaulx]

Originally Posted by Lafiro

Most of this tank has been with a passenger/lots of high rev's/70-110mph driving. And yes I have been driving in the street a lot more then highway this tank aswell. Top that off, I had a flat tire that I was on for who knows how long. My tires are basically run flat tires. But they were pretty low, only had like 5psi in them... Maybe that also was the reason why.....

And I have too much junk in the car aswell that I have to get rid off. I will wait till this tank is done, refill, empty the car out of all its junk(except my system), and drive at the most of 65mph for the whole tank and I will let you all know what I get again next week.(I say this cause this week will be almost all highway driving.)

a 5psi DROP would adversely affect your mileage, let alone the tires only Having 5psi. i think it is safe to say if your tires were properly inflated the effect on your tires at that psi was probably like driving through a muddy swamp.

[Yaris Dick]

Originally Posted by ketel0ne

It starts going down at about 52-53mph at 62 it just drops all the way off. To hold the yaris at 63-65mph you are getting like 28-32mpg. At 55mph the yaris is getting about 42mpg. This is in the automatic the manual may be different. At 60mph it is only turning 2600rpm. Cruise control would smooth this out a bit as well.

Hmmm. I've got 4500 miles on my LB Automatic. 90% of those miles are highway at speeds between 65-70 MPH. I've been averaging about 39 MPG under those conditions. My worst MPG since new has been 36.8 MPG with a 50-50 mix of hwy and city. Wonder if I got a special car or if this is a sedan versus hatchback issue?

[argylesocks]

Originally Posted by Yaris Dick

Hmmm. I've got 4500 miles on my LB Automatic. 90% of those miles are highway at speeds between 65-70 MPH. I've been averaging about 39 MPG under those conditions. My worst MPG since new has been 36.8 MPG with a 50-50 mix of hwy and city. Wonder if I got a special car or if this is a sedan versus hatchback issue?

65MPH aint too bad. and i would bet that you arent driving it like a 16yr old kid either :) i think 'certain driving styles' are the reasoning behind some people getting really bad mpg.

[sam07yaris]

Originally Posted by argylesocks

just got my best tank yet at 42.3mpg (US)

tires @ 44psi
highway: 55-60mph
city: lots of neutral coasting
dont use the A/C

ill switch to synthetic oil at my next oil change...

my best tank was 52.5 when I had around 2200 miles on my Yaris and only used 1.7 gallons. I filled up at Maine and drove back to massachusettes. 147 miles. I mean that was my BEST MPG, my 2nd highest is 45.3 on average for now is around 42.2


I noticed the difference in gas stations, sometimes you get a lot more since some of them thin the gas out. By far through some experimentation, Sunoco is the best. I am a regular Hess customer but lately I've been getting crappy MPG. I drive conservatively and I try to maintain a +, - 500 rpms between 2500 and 3000 rpms @ 63 mph. Coasting downhills as well as uphill through transfer of momentum before the peak is an added MPG if you do it well. *That's how I got 52.5 mpg* I am switching back the tires to 34 psi. Reason why is that I am at 201 miles and my tank is above the halfway mark which I think is unacceptable. Oh well, what are other people method of driving to conserve gas on a well fuel efficient car?

[pxpaulx]

are you keeping a detailed log of your mileage? because one 52.5mpg tank, filling up only 1.7 gallons can definitely be an anomaly in terms of how the pump filled your tank. i'm using www.gassavers.org garage system to keep track. in 772.6 miles so far i'm averaging 36.3 miles per gallon. considering its nowhere near broken in i'm pretty happy. most miles are commuting, i'd say probably 50/50 city highway.

[ketel0ne]

Originally Posted by Yaris Dick

Hmmm. I've got 4500 miles on my LB Automatic. 90% of those miles are highway at speeds between 65-70 MPH. I've been averaging about 39 MPG under those conditions. My worst MPG since new has been 36.8 MPG with a 50-50 mix of hwy and city. Wonder if I got a special car or if this is a sedan versus hatchback issue?

That hatchback weighs more, but it seems pretty even between the hatch and the sedan.

I have a hatch and have not had a tank under 38mpg in the last 8 fillups.

[Yaris Dick]

Originally Posted by ketel0ne

That hatchback weighs more, but it seems pretty even between the hatch and the sedan.

I have a hatch and have not had a tank under 38mpg in the last 8 fillups.

Per USA specs. the Hatch weighs 2293 lbs. The sedan: 2326 lbs. Albeit, hardly enough to argue about.

[ketel0ne]

I should have stated the auto LB weighs more than the sedan in any configuration at 2335. This is off the ebrochure on toyota.com We all should just figure the hatch door itself weighs about 500 lbs :), since the sedan has 2 doors and trunk too.

[pauljk]

Hatchback vs. Sedan FE - that's an interesting topic I've been meaning to bring up. I certainly don't have any scientific basis for this, and it's hard to get an accurate read from posts here, BUT my gut tells me, based on all the posts I've read here, that the sedan may get better mileage than the liftback.

IF this is true, could it be aerodynamics? It LOOKS like the sedan could be more aerodynamic than the liftback due to the less abrubt back end. But then I'm no aero-engineer.

Does the EPA do their testing on real roads moving through real air, or on rollers in a room?

???

[ketel0ne]

The liftback is 2.5 inches taller, .2 wider, and almost 19 inches shorter. Their turning radius are identical but the LB wheelbase is 3.5 inches shorter. Stock ground clearance is 5.5 inches on the LB and 5.8 on the sedan. Both have a coefficient drag of .29 supposedly because of diffusers added under the rear after wind tunnel testing.

I am not an aero engineer either.

EPA testing is done in a lab.

The EPA City/Highway fuel economy estimates are now 31 years young and were first implemented near the end of this nation’s first Oil crisis back in 1973/1974. The test(s) themselves were developed in 1972 to simulate a typical LA commute of that era.

EPA based Fuel economy is actually measured under controlled conditions in a laboratory using a standardized Federal Test Procedure (FTP) specified by federal law. Manufacturers test their own vehicles - usually pre-production prototypes - and report the results to EPA. EPA reviews the results and confirms about 10-15 percent of the total at their own National Vehicles and Fuel Emissions Laboratory.

In the laboratory, the vehicle's drive wheels are placed on a machine called a dynamometer that simulates the driving environment. The energy required to move the rollers can be adjusted to account for aerodynamic forces and the particular vehicle's weight.

On the dynamometer, a professional driver runs the vehicle through a standardized driving routine, or schedule, which simulates a “typical” trip in the city or on the highway. The City’s technical name is called FTP75 and the Highway’s test called the HWFET.

City Test (FTP75) represents urban driving, in which a vehicle is started with the engine cold and driven in stop-and-go rush hour traffic. The driving cycle for the test includes idling, and the vehicle averages about 20 mph.

Highway Test (HWFET) represents a mixture of rural and interstate highway driving with a warmed-up engine, typical of longer trips in free-flowing traffic. Average test speed is about 48 mph and includes no intermediate stops or idling.

Adjusting Estimates

In the early 1980s, an EPA study found that drivers were typically achieving lower fuel economy than predicted by EPA laboratory tests. As a result, EPA required the laboratory-derived city and highway MPG estimates posted on the labels of new vehicles to be adjusted downward by 10% for city estimates and by 22% for highway estimates to better reflect the MPG real-world drivers could expect from 1985 forward.

more info at http://www.cleanmpg.com/forums/showthread.php?t=1510

[sam07yaris]

Originally Posted by pxpaulx

are you keeping a detailed log of your mileage? because one 52.5mpg tank, filling up only 1.7 gallons can definitely be an anomaly in terms of how the pump filled your tank. i'm using www.gassavers.org garage system to keep track. in 772.6 miles so far i'm averaging 36.3 miles per gallon. considering its nowhere near broken in i'm pretty happy. most miles are commuting, i'd say probably 50/50 city highway.

I am not kidding seriously on my mom's passing recently. Otherwise I wouldn't be saying this. My g/f was shocked to say WTF how the hell is it 1.7 gallons? That was the first thing she said. It only took one bar and probably the 2nd bar if I had just went 10 more miles. Seriously this is what I saw and I'll stand to it. Now just remember it was around 2000 miles and since then it went lower to 45 then to 42. Right now its averaging 43 mpg. What the hell caused this? Is it the factory settings that settled after it's break-in period?

I am at gassavers also View sam's car there. I just joined a week ago.

[mhero]

I got 14Km./Litre
estimately 43.75 mpg ... is that right?