MPG/Range record for me!

[VX KAT]

Interesting...
In my mind, if the tire is rotating 1.8% faster, and at speedo 60, true speed is 58, wouldn't that mean that the ODO mileage is off by a bit... should be less than 411... which would mean that the MPG should be lower instead of higher. ??

I'm in no way a mathematician... actually, I suck at math. So, please help me understand this. Thanks!

no, I think it's when the ODO shows 60 mph, your ACTUAL speed is higher, so we're in danger of speeding and not knowing it...a bad idea around the cameras in AZ! I did mine with my GPS unit and found at 60 mph on ODO I was actually going 66 mph, that's with my 285/60-18s.

[pbkid]

yup, kat is right... if your speedo says 60mph then your going faster than that. your factory mph sensor is on the transmission. so if you add more diameter your going to go farther per rotation.

i always REALLY exaggerate these things to make them make sence. for example. if you put monster truck wheels on your VX, even when your VX said you went 1 mile, you would of gone more like 5 miles. so your moving at a faster rate. similar, if you put go-kart wheels on it, your would barely move at 10 mph on your speedo.

[etlsport]

silverbullet, your right, it is backwards..

your tires are smaller than factory.. most everyone else is doing adjustments for larger tires, thats why it seems backwards to you

[SilverBullet75]

Thanks Etlsport! Thought I was going nuts! (not ruling that out though)

So, with that said, what sould i multiply by to get my true MPG?