21 MPG whats wrong

[P205]

what NEexpat seems to make sences

[Kaotic Lazagna]

Yeah, when the engine is cold, the ECU runs pig rich. On my Scan Gauge, it'll read on average in the teens and low 20's, but then again I have a heavy rim/tire combo. But with that being said, even if I'm smashing on the gas all day everyday, I'll still be in the low 30's mpg.

And with that being said, I'll say check your tire pressure and make sure it's 32 psi at the lowest (I drive around at 51 psi), and check your alignment. Those two can really kill your mpg's.

[P205]

I have my psi at about 46 and the car drives straight as an arrow,

[Kaotic Lazagna]

hmmmm, I would have your brakes checked. They might be producing too much friction, causing your engine to work harder to get the car to speed and to maintain speed. If your tire pressure is high and your alignment is within manufacturer specs, you really shouldn't be having mpg issues.

So have your brakes checked, change your spark plugs, and change your intake air filter. Also, if you are using cheapo gas, I'd suggest switching to a top tier station.

[P205]

I have gotten new spark plugs, what you you guys prefer ?

[Kar98]

Originally Posted by P205

I have my psi at about 46...

That's a lot. I'd stick with 32.

[charles nelson]

Popular Mechanics had an article about tire pressure and mpg. The manufacturers recommended pressure is designed to put the least wear on the suspension. Significantly higher tire pressure will increase your mileage (less road friction) but will greatly increase suspension wear. So with higher pressure you get better mileage and lower fuel costs but higher repair bills later on.

[caineroad]

it is possible... translate into km that is 350km. On my yaris, i fit it with mini cooper 17" wheels(heavy) and now i've lost 30km on a full tank.

I drive 50/50 city and highway, and I am only getting 430km, then the fuel light flashes, about 9.4L/100km.

so basically if I were doing 90-100% city, it is not surprising to get 350km(218 miles)

if you do the math, or just google look it up my numbers translate back to your mpg or miles, you will get an idea.

my car is completely stock under the hood.

[P205]

well i find it odd because looking at the mpg people are getting in the forums, a lot of them are getting Lazy 30mpg all city driving

[Kar98]

Originally Posted by P205

well i find it odd because looking at the mpg people are getting in the forums, a lot of them are getting Lazy 30mpg all city driving

Yeah, city driving, I'm driving 17 miles to work in one rather large city. Not three miles, and letting it idle for two minutes. I'm surprised you're even getting 21 mpg.

[tooter]

Originally Posted by caineroad

it is possible... translate into km that is 350km. On my yaris, i fit it with mini cooper 17" wheels(heavy) and now i've lost 30km on a full tank.

I drive 50/50 city and highway, and I am only getting 430km, then the fuel light flashes, about 9.4L/100km.

so basically if I were doing 90-100% city, it is not surprising to get 350km(218 miles)

if you do the math, or just google look it up my numbers translate back to your mpg or miles, you will get an idea.

my car is completely stock under the hood.

You just implied another variable that no one seems to ever mention:

Wheel Diameter

Almost everyone here runs different diameter rims combined with a wide variety of different sized tires...

...and yet no one seems to be factoring in their wheel diameters to adjust their odometer readings to arrive at their actual gas mileage.

I changed my rims and tires just like everyone else, except I used a wheel diameter chart to determine the tire size and aspect ratio so as to keep the diameter within 1% of the stock diameter so that my odometer continues to give accurate readings.

[P205]

I wonder if by city driving people are in the city on the highway long trips at high speeds, when i say 100% city driving i mean stop lights often

[tooter]

Originally Posted by P205

I wonder if by city driving people are in the city on the highway long trips at high speeds, when i say 100% city driving i mean stop lights often

I know what you mean. I often drive in traffic for long periods of time. My last fillup was only 36mpg. The computer showed the overall average speed for that fillup was only 7 mph!

[jambo101]

Something aint right try some of the obvious fixes then i'd say it would be worth your while to take it to a reputable garage and get it fixed..
http://www.carsdirect.com/car-buying...ad-gas-mileage

[OTA'sTOY]

OP did you change your oil lately?

[P205]

yes i did, 5w 30 royal purple

[Martinezn.964]

Original Intake gets you better gas milage. Try it

[Martinezn.964]

Also check alignment