Mileage question

[VanoFord]

So I got a ticket today... I knew my tires were throwin the speedo off, but 20%? I'm checkin it today w/ a GPS app I downloaded.

My question though, if my tires are throwing my speedo off by 20%, wouldnt my mileage be off by 20% as well? So for instance, if I get 300mi on the tank, it really equates to 360mi?

 

[JoeBlow83]

Roughly, wich also means that your truck is not counting accurate mileage for the odometer.

What size fuel tank do you have?



edit- Also, the best way to find out exactly is to use the GPS to drive exactly one mile and compare that to the trip meter in the truck. Find the % of error there and you'll be golden.

 

[VanoFord]

yea, i figured my odo was off as well. not too concerned with that since it reads 39k on a lariat cluster in a XLT truck lol. I have equated my mileage by hand (google maps mileage from home to work DIVIDED BY total gallons). I have the 28 gallon, however can only get 27+ whenever I fill. I can go to & from work 4 times then I am empty. 42.5 mi 1 way, 95 miles round trip + 5 miles @ lunch = 100mi

400 miles @ 27 gallons = 14.8

Thats about right. My truck reads 12.5 mpg at the end of every tank, @ 20% would be 15mpg. I'll do a reset next week when I drive 4 days straight and recheck.

Thanks, i'll try the gps vs trip. Guess I was doin 85 lol.

 

[Raiderh8r89]

Good question Vano, I was wondering that as well...

How ya doin' bud?

 

[VanoFord]

livin life and bein good. how bout dem BEARS huh? Those chargers have turned it around too, however they always shine Nov/Dec/Jan

 

[cowboy]

the quick answer is yes it would throw everything off. To test Drive 60MPH for a minute and see what the odometer reads if your off by 20% you should be at 1.2 miles

 

[UnleashedFord]

just go speed limit, whats so hard about that lol

 

[ak_cowboy]

He doesn't know if he's exceeding the limit cuz his speedo is off, and I would drive 10 miles, one isn't enough.

 

[JoeBlow83]

He doesn't know if he's exceeding the limit cuz his speedo is off, and I would drive 10 miles, one isn't enough.

One is enough if you're using GPS to calculate the difference vice your trip meter. 10 is ok, too but whatevs.

 

[VanoFord]

just go speed limit, whats so hard about that lol

I thought i was going the speed limit, based on my cluster sayin I was doin 70. I'll GPS on the way home and see what it says.