I have had my truck for 2 years now. Last weekend was the first time I took it on an extended hunting trip. Mission BC to Quesnel BC...odometer read 608km adjusted for 285 tires comes out to 657km or 411 miles. Filled up and used 68 litres or 18 US gallons. 23 MPG(US gallon)...

Tried to keep tach at 2000 rpm truck has 3.73 gears, and loaded down with 1000lbs or so of gear. 2 Honda CT-70's, 150lb Tirfor, 200lbs of tools, etc. etc

Recent mods include cone filter, boost fooler and resisted baro. Truck runs about 4-5 psi at 2000 rpm. Highway is by no means flat..several long hard pulls from 7-13%.

I also ran 4 days in the bush in 4wd and averaged about 15 mpg on 250km..Very Happy.:)

That's pretty good. How do I adjust for 285's? I haven't been able to figure it out.

If 245/75 is the stock size...

Circumference of the stock tire = (pie)*d
= (3.1416)*[(24.5)/(2.54)*(.75)*2 + 16]
= (3.1416)*[30.4685] <----PIE TIMES TIRE DIAMETER IN INCHES
= 95.72"

Circumference of the 285 tire is found by substituting 28.5 into the above equation in place of the 24.5, and the result
= (3.1416)*[32.83]
=103.14

Now you just multiply the miles traveled per the odometer times (103.14/95.72 =) 1.0775 to get the actual miles traveled on the larger tire.

There's really no need to covert the diameter to inches since you're solving for a unitless ratio, and so the 2.54 conversion factor could be removed from the above equations. However I, like most folks from the unit-stubborn ol' USA, like to see things in feet and inches as opposed to centimeters and millimeters. ;)

tack on another 7.5% to your milage and youll have your actual milage.

tack on another 7.5% to your milage and youll have your actual milage.

7.75% would be more accurate, depending on tire wear. :cool:

I use 8% for easy math...

I too prefer to use feet and inches....
However 411 miles with 15 Canadian gallons is 27.4 MPG (Canadian)...sounds better.... :D

Another option on a long trip is to do get the road mileage on line. I use Map Quest, but there are other trip/map type programs out there. Get road miles from fill up location to fill up location. That divided by you fill up gallons will give you your mpg. You can also use the odometer read miles and come up with your own "correction" multiplier.

Another option on a long trip is to do get the road mileage on line. I use Map Quest, but there are other trip/map type programs out there. Get road miles from fill up location to fill up location. That divided by you fill up gallons will give you your mpg. You can also use the odometer read miles and come up with your own "correction" multiplier.
Or use a GPS. My MS Streets and Trips software on my laptop allows me to track wherever I go and gives me an exact distance driven between start and stop of the trip. For measuring distance driven you can't beat it: +/- 8 feet on a transcontinental trip. It is so accurate it will even show lane changes on a divided highway.

you can also use those radar trailers that the cops set up to let you know how fast you're going. I've found that with 245's my speedo is about 8% fast.

You mean one of these ? , good tailwind that day. :cool:

:funnypost yep...one of those

I pull up alongside someone with a digital speedo...
Good lookin' blonde 24-2-30 if possible...;)

Where have you bought yours stainless oil cooler lines? Thanks.

trebor Where have you bought yours stainless oil cooler lines? Thanks.


Had a local hose shop make them up..