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.