MPG/Range record for me!

[SilverBullet75]

To reset the computer just unplug the battery for about 1/2 an hour. Learned this from a different thread on here. Glad I did... immediate difference. The VX RAN differently on the highway. The motor was actually quieter and smoother...

As for the muffler...
After I tried the Flowmaster Super40 and loved the sound but hated the MPG, torque loss, etc... I went with a Cherry Bomb Vortex. This is very similar internally to the Flowmaster, with an added element... glass packed innerds!
Noise level... if the Flowmaster was a 10 at it's loudest, the Vortex is a 7.
Performance/Torque... Stock is a 10, Flowmaster is a 5, and the Vortex is a 9! Barely any loss. (Rephrase... barely any loss now that the computer is reset!)
MPG... Stock I had max range of 370 miles. Flowmaster, around 327. Vortex... 411. BUT, before I did the computer reset, the Vortex had 327ish too... So, it's very possible that the Flowmaster could have been better if I had known about the reset trick back then.

Also note... I'm NOT a Grandpa on the road either...
AND, this is the 3rd week in a row that I've had mileage in the 400 range.

Now... before I get too excited. Could someone tell me the variance to multiply by for 255-55-18 tires?
Being that these are wider than stock and not taller (by much) I don't see the numbers changing too much. Could be wrong...

Thank you!

[VXorado]

My 32" tyres throw the ODO off 6.84%, so your 33's would be off about 10.2%.

Calculate your MPG as per the ODO in the normal manner, then multiply by 1.102.

PK

I was planning on using google maps and calculating the mileage by using the known miles from one location to the other... but I think your method is a bit easier. Thanks.

To reset the computer just unplug the battery for about 1/2 an hour. Learned this from a different thread on here. Glad I did... immediate difference. The VX RAN differently on the highway. The motor was actually quieter and smoother...

As for the muffler...
After I tried the Flowmaster Super40 and loved the sound but hated the MPG, torque loss, etc... I went with a Cherry Bomb Vortex. This is very similar internally to the Flowmaster, with an added element... glass packed innerds!
Noise level... if the Flowmaster was a 10 at it's loudest, the Vortex is a 7.
Performance/Torque... Stock is a 10, Flowmaster is a 5, and the Vortex is a 9! Barely any loss. (Rephrase... barely any loss now that the computer is reset!)
MPG... Stock I had max range of 370 miles. Flowmaster, around 327. Vortex... 411. BUT, before I did the computer reset, the Vortex had 327ish too... So, it's very possible that the Flowmaster could have been better if I had known about the reset trick back then.

Also note... I'm NOT a Grandpa on the road either...
AND, this is the 3rd week in a row that I've had mileage in the 400 range.

Now... before I get too excited. Could someone tell me the variance to multiply by for 255-55-18 tires?
Being that these are wider than stock and not taller (by much) I don't see the numbers changing too much. Could be wrong...

Thank you!

Here's a website I just found that lets you compare tires sizes and the exact difference in ODO readings. Wider shouldn't be a problem but the height will throw the ODO off because one rotation of the stock tire will go a further/shorter distance than a differently sized tire.

http://www.1010tires.com/TireSizeCalculator.asp

[SilverBullet75]

Thanks!

So, it looks like my Nitto Terra Grapplers are 1.819% different from stock. I tried doing what you said, multiplying my MPG (19.3) by 1.819, but I don't think I'm doing something right, because I got 35.1067... now what?

[vt_maverick]

Thanks!

So, it looks like my Nitto Terra Grapplers are 1.819% different from stock. I tried doing what you said, multiplying my MPG (19.3) by 1.819, but I don't think I'm doing something right, because I got 35.1067... now what?

I think you want to multiple by 1.01819... which would be close to 19.65.

[SilverBullet75]

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!

[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.