28mpg Help

[Yoda]

Ok with my driving style i get either in the high 29s or 30 mpg. For the last month i have been seeing my mpg drop down to 28mpg. The best i could pull with everything posted here was a mere 30mpg. Before i could get 34mpg using all the techniques listed.
I am at the 19.5k mile mark right now and I use Shell 93 and synthetic oil. Does anyone have a clue as to what could be up. I know its not a major decrease but its been really bugging me. :help:

O and I tried cleaning my air filter already and oil was changed about 1000miles ago

[Revsson]

Tire pressures?
Using the A/C more than usual due to the heat wave across America?
(Or is that ruled out because you live in Florida, and are using the A/C all the time?)

Just throwing out some ideas.

[cfeng]

shell 93 is good stuff but not for the yaris. try a high quality 87 octane. check tires for pressure and brake pads for rubbing. personally, i've never had the patience to achieve amazing gas mileage. i get around 34 mpg, but im driving harder than necessary

[Yoda]

forgot about tire pressure and i dont run the a/c i just suck it up lol

[RangerBEH]

I have a automatic hatchback and I was getting 34 mpg. The car currently has 21,000 and for the last 2 thousand miles its been getting under 30mpg. I was told by a friend with the same car that he is getting 38mpg. I don't drive hard, don't accelerate fast, use A/C and heat about half of the time. my driving is about 1/3 city and 2/3 highway.

if anyone has any suggestions i am all ears.........:confused:

[sickpuppy1]

I have a sedan and use the AC 90% of the time. I take it easy and while 75% of mine is highway, I'm getting 36 avg mpg. One of the biggest increases came from bumping my air pressure up to 40 PSI. I know there is debate back and forth about doing that and I will NOT go to tire max of 44. I actually don't like it at 40 as it make the ride rougher. I'm keeping a close eye on wear with a depth gauge as my final determination. It did make about a 2-3 mpg difference though......
And as far as octane of the gas, 93 octane wont increase mileage, just your bill. If the engine isnt "knocking" it doesnt need it. period. I use regular 87 octane all the time. Experiment with brands too. I get better mileage with Quick Trip or Shell rather than Phillips 66. Go figure,lol

[ctrj]

You must be mashing the throttle. Jack rabbit starts and mashing your throttle to the floor will hurt your mileage.

[Yaris Hilton]

"Driving without brakes" is likely to give a considerable boost to your mileage. Whenever you touch the brake pedal, you're converting kinetic energy you've built up by burning costly gasoline to waste heat. Plan ahead so you can mostly coast to stops. Never accelerate when you can see you're about to have to slow down or stop again. If you can coast up to a red light so the light changes before you get to it and you get to keep rolling without stopping, you've really won big!

[sickpuppy1]

Good ideas YH. "plan your work and work your plan"

[Kal-El]

Regardless of what you may hear, A/C use has a negligible effect on fuel efficiency. It might cost you 1 MPG/gal. Who cares.

And no A/C in Florida? :eek: My A/C is on anytime it passes 70 degrees F. Seriously. I refuse to be uncomfortable at such little cost.

[sickpuppy1]

I dont have mine on that low, but I also dont have the humidity they have in Florida. Its bad here, but not soupy like the "deep south"

[daf62757]

Regardless of what you may hear, A/C use has a negligible effect on fuel efficiency. It might cost you 1 MPG/gal. Who cares.

And no A/C in Florida? :eek: My A/C is on anytime it passes 70 degrees F. Seriously. I refuse to be uncomfortable at such little cost.

You sir, exhibit the behavior of a very smart man!

[Yoda]

thx for all the help i will change my tire pressure and see whats up

[STC]

"Driving without brakes" is likely to give a considerable boost to your mileage. Whenever you touch the brake pedal, you're converting kinetic energy you've built up by burning costly gasoline to waste heat. Plan ahead so you can mostly coast to stops. Never accelerate when you can see you're about to have to slow down or stop again. If you can coast up to a red light so the light changes before you get to it and you get to keep rolling without stopping, you've really won big!

Well said! :thumbsup:

Cheers!

[RangerBEH]

i will check the tire psi on mine as soon as i can. it makes sense that that could be a huge contributing factor.....

[RangerBEH]

i just got off the phone with a toyota dealer who recommended 5w-20 synthetic for my 2007 yaris. he said it should help a bit (i was overdue for an oil change anyway)

[Lucas13]

Ok with my driving style i get either in the high 29s or 30 mpg. For the last month i have been seeing my mpg drop down to 28mpg. The best i could pull with everything posted here was a mere 30mpg. Before i could get 34mpg using all the techniques listed.
I am at the 19.5k mile mark right now and I use Shell 93 and synthetic oil. Does anyone have a clue as to what could be up. I know its not a major decrease but its been really bugging me. :help:

O and I tried cleaning my air filter already and oil was changed about 1000miles ago

Disconnect you battery for 30 minutes, this will reset your ECU and will re-learn the settings,use quality regular gas such as chevron, shell etc, adjust your driving habits, be easy with the throttle and try to use the techniques available in the forum in order to safe fuel I hope this helps:thumbsup:

[Yoda]

THX!

[Yoda]

what should my tire pressure should be? the size is 205/50/r15

[Thai_Dang]

My r15 came from the dealer at 44 psi, i checked w/ a digital gauge. I kept it at 44 for fuel economy. But people have been running pressures from 32-60. On the safe side, just stick to max side wall, and lower to 32 if you want a smooth ride.

[Kal-El]

what should my tire pressure should be? the size is 205/50/r15

A good balance would be about 36 psi. More than 45 is getting into what many consider too firm/harsh which can also prematurely wear on suspension components. Though good things will happen for fuel efficiency. Tire manufacturers/automakers almost always recommends 32 for cars for what is considered a perfect balance of ride, performance, safety, wear, and fuel efficiency. It's up to you to determine your priorities. Just as there're tons of different tires intended for all kinds of individual conditions, tire pressure is variable as well. No one tire does it all, no one pressure does it all. Just don't run lower than 32 or higher than the sidewall indicated max.

[Yoda]

thx this was very helpfull. you guys rock...lol

[Yoda]

update got my mpg back thanks

[STC]

^ Good! :smile:

[Kal-El]

update got my mpg back thanks

Nice! What specific changes did you make?