You two bring up some valid points that I had already thought about. So lets discuss it. This is still in the wishful thinking/mental exercise/get folks thinking stage (gotta start somewhere).
As an aside, I googled gas prices in western Canada. Converting Canadian to US dollars, and just going with four liters = one gallon (I know it is a little more than a gallon), it comes out to roughly $5.00 (US)/gallon. So based on $5.00 (US)/gallon of gasoline:
At 15mpg (Jeep TJ) figure a 5,000 mile trip = $1,675 in gas.
Truck at 11mpg (96 Ram 1500 4x4) figure a 5,000 mile trip = $2,275 in gas (ouch).
And at 30mpg (Yaris) figure a 5,000 mile trip = $835 in gas. Highway the Yaris should get mid 30s as it sits now.
So... $700, $800, $850... whatever; that's my tipping point. Spend more than that to get the Yaris ready, and I might as well take the TJ & trailer. Or not.
A 1.2" lift - I don't think that'll affect mpg too much (we'll see - I already ordered this one). I think I paid $165 for the lift? Actually, lifting the Yaris is also for increased approach angle. There's two ferries you have to get on when doing the Dempster. They drop a metal gate down on the bank and you drive on/off. You want to make sure you can get up onto the ferry (think approach and departure angles). And I'll supply the labor for lift install, so no cost there (hopefully no additional parts needed).
I'll probably upsize the tire just a little bit if I get new tires (some all season tires a bit on the aggressive side if I can find them in my desired size). Not changing my steel rims. From stock 185/60/15 to 195/60/15 or 185/65/15 or 205/60/15 (this last one is 1" taller than stock - the largest I would go). Again, should be a (hopefully) minor hit in mpg. That'll be my biggest cost (and I need five of them - ~$300 - $500 total). Or I could just run with what I've got if they've got decent tread. You want good tires on the Dempster. It is a dirt road. 1200 miles of it round trip. And the tires on the Yaris aren't exactly new (they've got some wear on them). If I were to take the TJ, I would definitely put new tires on it first (they're much more worn - they could use to be replaced). For all five that would be close to $1,000 (but they need to be replaced anyways....).
Roof rack? I need to check out the used roof rack places. Or take the one off the TJ and put it on the Yaris. So anywhere from well under $100 (for brackets to mount the one I have on the Yaris) to a couple hundred dollars. There are cheap racks out there that I don't care for. It would be the kayak on the Yaris' roof that possibly really hurts the mpg.
Modify the inside of the Yaris (remove passenger seat and make a platform)? Under $100 (I've probably got the scrap plywood I would need in the garage already).
So why go through all this ?
1. I want to run the Dempster all the way to Tuk, and kayak the Arctic Ocean. And I want to see if I can save some money on gasoline (these multi-thousand mile trips are getting expensive!).
2. Other than the Dempster Highway itself, it is all paved roads. You don't really need 4WD (so the Yaris should work). Gas stations and buying food along the way is not an issue (other than the initial 225 miles of the Dempster where there truly is NOTHING between starting it and when you get to Eagle Plains). And FYI, a little past Eagle Plains is the Arctic Circle (dress warm).
3. I'd like to be able to sleep in my vehicle (this could almost be #1). Can't really do it in the TJ (haven't tried removing the passenger seat though and seeing how that would work - although that might be something I look at later... but don't forget the 15mpg thing). I can (and have) sleep in the back of the truck, but even though I have a pass-through window between the cab and the bed, I've never tried to go through it. I usually go out the back of the truck. And there's the whole 11 mpg thing with the truck....
4. And more importantly, I thought it might be fun (oh no; I used the "F" word) to do something different. And maybe some folks out there who don't have a tricked-out Toyota 4-runner or Tacoma or 4-door Jeep Wrangler or full-sized truck (or whatever 4WD overlanding vehicle that gets lousy mpg) would like to give it a shot in whatever vehicle they have. Not many folks who organize an overlanding trip (in the USA anyways) would "allow" small 2WD economy cars on their overlanding trip. A KIA Soul would be cool on a trip like this. Got a 2WD Ford Escape? 1990 2WD Isuzu PU? Think about it. Think outside the big 4WD 4-door "box". Waddayagot?
5. Just to be different. And part of it is the challenge (to make it work). This is about the journey as it is the destination. So far it is a mental exercise (except for the lift kit I already bought), and seeing what interest is out there. Yeah; I'd have to downsize gear to take the Yaris, but usually I only use a fraction of the stuff I bring on a trip.
Comments? Lets hear them. Lets have fun with this (uh oh... I used that "F" word again).
How would you make this work for you?