Hey everyone the last tank of gas I went through I got 23mpg. I just bought new tires for the car, and have new intake on its way. The intake I have was a ____ty system probably bought on ebay. It affected my Mass air flow sensor and car is runnning lean.

is 23mpg low for this car? any ideas on what could be going on ?

How do you know it affected the MAF? Did it set a code? If so, trash the intake and go back to stock, the CAI isnt getting you any noticeable gain, so it isnt worth any hassle. Just in case you didnt know already, the 07-08 intakes are not compatible with an 05-06 and vice-versa, so it could be that you have the wrong intake.

But, as far as mileage, I average (last average I took was for a 12 month interval I think) about 24 mpg overall. On road trips, with cruise set at 80 for 9 hours straight, I see about 30 mpg or so. If I am hitting rush hour a lot in town, doing a lot of stop and go, I have seen it go as low as 21 mpg. So it can vary a good amount, especially if you just measure for one tank.

Of course, for the past couple of weeks, I have gotten about 32 mpg in town back and forth to work....... but I have been driving my saturn sc1 "winter" car :P

For city driving, that's pretty much average... you'll probably see a slight improvement once your car is running right.

I always get around 23mpg. 40%city 60%highway

Considering the sticker shows 24 city/29 hwy (5-spd), 23 is right around the city numbers. I get 25-26 (70% hwy/30% city) and I've got a pretty heavy foot...I only get about 13 mpg in a Jeep Grand Cherokee and 29 in a Jetta (which is rated at 38). And that 25-26 included a few daily burnout to heat up my tires when it was extra cold outside, if I didn't do it, I'd lose traction with any throttle on turns..my tires are dead :nails: .

i get 21... and im 70% city

i can get as low as 20mpg and as high as 33mpg.

and if you were running lean, that would mean you should be getting better mpg right?

is 23mpg low for this car?
No, at least not for me. I can only wish mine were that good city driving, but often get <20mpg because it's fun to have your foot in it a lot. On the highway I do better than 23mpg, but only when I keep it under 70, otherwise it's worse.

and if you were running lean, that would mean you should be getting better mpg right?

No, if the ECU is seeing lean, it's going to add more fuel to try to balance the AFR.

The lowest i ever got in my car was 24, but when i drove from Idaho to South Carolina i got and average of 30.94 It is all going to depend on your driving environment and style. But then again, if your Air intake is not hooked up right then it could be using more fuel to compensate. Good luck!

i get about 23 pure city

I get 16... That's all city with a shift point of 3200-4000.

When I had mine, I averaged about 23-25 mpg in a mix of city/highway driving.

Be thankful, I only get about 15-16 in my current vehicle...

i get 20 city and 35 highway... so stupid

Hey everyone the last tank of gas I went through I got 23mpg. I just bought new tires for the car, and have new intake on its way. The intake I have was a ____ty system probably bought on ebay. It affected my Mass air flow sensor and car is runnning lean.

is 23mpg low for this car? any ideas on what could be going on ?

It sounds like mpg is more important to you then hp.

The CAI (the proper one) will give you a slight boost in hp (what 4-6 hp) , but no added mpg.

If you want slightly improved mpg, then ditch the CAI , get a K&N or TRD drop in air-filter ($50), if you have a air-intake snorkle on your car( forget if tC's have them, or not) get rid of that. = That will result in maybe 1-2 more hp , but mainly will give you slightly better mpg = maybe 1-3 more mpg (approx. about 5-10% increase).

Personally, I'd only go CAI if your intensions were to do the full system, CAI, headers, awesome exhaust .... maybe even take it a further step and go super-charged .... you get the idea.

forgot to ask...

What kinda new tires did you buy ?

If you went with the standard 215/45/17" ... with proper air-pressure , then that should be fine (or go lighter with a 16" wheel ... but most people don't want to go down a size in wheel circumfence = to then get a lighter overall wheel).

I usually get 26 mpg if I'm driving normally, about 90% city, mostly in 2nd gear during rush hour... but I wouldn't say that 23 is bad (unless you're used to higher).

When I got new tires on my old car (Falkens) I found I drove it much harder because I couldn't believe how much grip they had... so that killed my mileage by about 4 mpg.

Are you driving any differently?

In 100% city driving I get as low as 17mpg.
In 100% highway, i've gotten 30mpg.

dude Im getting 18 mpg

i used to get about 260m out of 12 gallons
now I get 220

anyone know why I get the drop in mpg?

havent changed anything in the car or engine between the sudden mpg changes.

could it be that I need to fill up the tires a bit more? possibly losing some pressure. Not sure if that would be the cause or such a drastic change in mpg though.

dude Im getting 18 mpg


could it be that I need to fill up the tires a bit more? possibly losing some pressure. Not sure if that would be the cause or such a drastic change in mpg though.

Air-pressure in the tires is a serious matter. You should be checking to make sure you have good pressure(what ever your side wall says... 40 psi??) , every 3-4 weeks.

Are you putting in 87 octane gas ?
Do you have a CAI ?
Any engine mods ?

Do you gas it up to/ fairly close to stop signs/stop lights .... or do you coast it in gear while coming up to intersections. Utilize gravity .... it is your friend. Do you have a lead foot ? When do you shift(at what rpm's) ?

dude Im getting 18 mpg


could it be that I need to fill up the tires a bit more? possibly losing some pressure. Not sure if that would be the cause or such a drastic change in mpg though.

Air-pressure in the tires is a serious matter. You should be checking to make sure you have good pressure(what ever your side wall says... 40 psi??) , every 3-4 weeks.

Are you putting in 87 octane gas ?
Do you have a CAI ?
Any engine mods ?

Do you gas it up to/ fairly close to stop signs/stop lights .... or do you coast it in gear while coming up to intersections. Utilize gravity .... it is your friend. Do you have a lead foot ? When do you shift(at what rpm's) ?

Don't forget that it's also the Winter, denser air means more power, which means more fuel. Also, you should factor in warmup times, wether you're letting it warm up, or just driving it...you're still going to use a bunch of extra gas.

To the OP, lose the eBay intake. I wouldn't doubt if it was restrictive, which easily leads to less power and less fuel economy.

[quote="Super-Stormtrooper07"][quote=RnB180]
Don't forget that it's also the Winter, denser air means more power, which means more fuel. Also, you should factor in warmup times, wether you're letting it warm up, or just driving it...you're still going to use a bunch of extra gas.

Yeah I went from between 25-30 MPG to closer to 16/17. Course it is flippin cold around here, and it takes close to 10 minutes of idleing until the engine sounds "right". Can't wait until spring!!

You should be running what it says on the door jam or in the manual for tire pressure, not what it says on the tires. 32F/29R for the tC. You should be checking this regulalrly, because as mentioned above it will change with temp.

You can raise the pressure a bit and get a tiny bit of improvement in mileage, but if you go too high you will wear the tires in the center too quickly

You can raise the pressure a bit and get a tiny bit of improvement in mileage, but if you go too high you will wear the tires in the center too quickly

And another biggie is to make sure you haven't driven for at least a couple of hours before you measure the pressure. Driving heats up the air in the tires, making the pressure go up- and giving you false readings. Plus, if its REALLY cold outside, the pressure will drop alot- so you don't wanna overfill them either.

man there's just so many factors that go into mpg. but 23 is my average with about 60% highway and 40% city so dont worry about it

i think my sidewall says max 50 psi
but I have them filled to 40psi

should I add more air?

hmm, my guess is shift points... with 75/25 city/highway driving i usuallly get 19 to 20 mpg... but this last tank i decided to try to keep it under 3k through out the gears.. which i admit i kouldnt hold back a few times... but still by keeping it under 3 k i got 25 mpg 75/25 city/highway...

for me thats a BIG difference... hell thats 60 miles extra!..

oh and that with I/E..

some of the lower results are kinda surprising. This winter we've been averaging around 24-25, combo hiway/stop & go, and that's in a winter that so far has dumped over 80" of snow and had multiple am's when the temps were -10 or colder..... we can pull maybe 28 in summer if driving decent, but he sc is too much fun not to hammer so don't always strive for economy. But i don't think we've ever dropped below 23-24 mpg's.
Now our FJ, when in either 4wd or pulling the boat..... that's another story... gotta luv when both rides run premium and it's always over 3.00 per gallon...

ever since they started putting 10% ethenol in gas i have been getting bad milesage

better grounds, proper tire pressure, synthetic oils and lubricants, don't rev so high! ive been averaging 25-26mpg mix ob both city and highway driving

ever since they started putting 10% ethenol in gas i have been getting bad milesage

I know chevron does not.

^^ when did they start doing that? could be the reason why my mpg peaked up after getting to about 3k miles and just dropped.

i typically get between 20-22mpg, but i do like 65% city driving, and theyre short trips too.

unfortunately the only chevron near my house is really close to the freeway (aka huge price hike), anyone know anything about 76 and Shell?

i think my sidewall says max 50 psi
but I have them filled to 40psi

should I add more air?

Just as I said before, you run what is on the door jamb of the car, not what is on the tire itself.

i think my sidewall says max 50 psi
but I have them filled to 40psi

should I add more air?

Just as I said before, you run what is on the door jamb of the car, not what is on the tire itself.

QFT.

So many people disagree, but the number on the tire is MAX psi, which means if it says 42 psi, and you put in 42 psi...that tire will have about 45 in it after it warms up. Plus the manufacture has no clue what vehicle that tire is going on. The number in the door jamb is the one to go off of, no matter what tire is on the car.

i think my sidewall says max 50 psi
but I have them filled to 40psi

should I add more air?

Just as I said before, you run what is on the door jamb of the car, not what is on the tire itself.


I cant run the tire psi written on the on the cars door.
I run on 18's and the stock psi rating are for 17s.

I took my car in for oil change and the people at the service stop in toyota lowered the psi to the door spec and 2 days later tire pressure light kicks in.

not to mention the rims riding reaaaaal close to the ground as the tire sags.

oo well in that case, its different. And i too get slower gas mileage, alwyas thought it was some of my bolt ons. I too get a 19-20 city shifting at 3k but im stil lhappy becuz wen i go highway i get about 30. Anyway when did they start putting 10 percent ethanol? Maybe thats why my car start losing mpg too, was it around november?

I wish I got 23mpg. If I stay out of boost Im lucky to see that with highway driving.

Doesnt a turbo generally give u better mpg?

i average about 24 mpg now.

bump

i think my sidewall says max 50 psi
but I have them filled to 40psi

should I add more air?

Just as I said before, you run what is on the door jamb of the car, not what is on the tire itself.


I cant run the tire psi written on the on the cars door.
I run on 18's and the stock psi rating are for 17s.

I took my car in for oil change and the people at the service stop in toyota lowered the psi to the door spec and 2 days later tire pressure light kicks in.

not to mention the rims riding reaaaaal close to the ground as the tire sags.

Even with the 18's, your tire pressure should still be near the door jamb ratings. I don't know the tC pressure off the top of my head, but Toyota is probably filling them up to the exact amount. Then when it gets cold, you lose 2-5 PSI and it triggers the light to come on. 40 is too high for our car, plus you're going to have horrible tire wear with pressure that high (about 44 PSI after those tires reach operating temp). Just do the door jamb + a few more pounds and you'll be fine.

door jamb is 31-29, But people just tell me to do 31-31

my tC gets about 19 in town sometimes less, and about 30 on highway, its general mix of 50/50 highway city is around 25mpg. It has gotten as high as 34mpg on the highway but that was for a short period after i added the NJK plugs and K&N filter, then several months later it went back down to around 30 to 31 highway mpg.

-R