21 MPG whats wrong

[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

[caineroad]

Originally Posted by tooter

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.

Good job you brought this up... i didn't realize that.

Ever since I changed to 17' Cooper S rims, my speedo is slower than actual speed. Therefore the distance counter must be also slower (less), that would make sense to the loss mileage!