Where is the outside temperature sensor located on a 2000 Mitsubishi Colt Rodeo 2800TDi 4x4?

Not sure on that model, but they usually can be found around the grille opening. Somewhere where they are able to get a ample supply of fresh air.

http://workshop-manuals.com/mitsubishi

a mitsubisi trition my side of the world

Third generation (1995-2006)

Haynes Manual Mitsubishi Colt 2005 - WordPress.com

https://heisembtora.files.wordpress.com/2015/.../haynes-manual-mitsubishi-colt-2005.

Fuel consumption figures usually don't mean very much as there are lots of variables affecting consumption in the real world.

The EEC force manufacturers to state consumption figures for cars sold in Europe. One or two of those are results from constant speed tests but the third is called the urban cycle which is a realistic real-world figure but don't forget the Imperial gallon is bigger than the US gallon so it is probably better to stick to litres.

Few motoring journalists have a vehicle long enough to produce useful consumption figures and simply recycle each other's information. A few journalists test a car for a week or longer and do produce their own useful figures.

When searching for reliable information it is important to know what sort of driving, the type of country, the ambient temperature and so forth as hot or cold weather can affect consumption significantly so any figures you find are fairly useless without qualifying information.

several possibilities
battery to low to spin the engine fast enough
sir in the system. electronic stop keeps the fuel shut off.
immobiliser not operational. can/crank position sensor problems. broken timing belt
glo-plugs not working
run the fault codes to see if any sensors are recorded.

there are two vehicle speed sensors on the 2000 rodeo 4x4. One on the left side of the transmission case and one on the right side of the transfer case, the one that located on the transfer case

You can find it here

I know some flywheel torque Mitsubishi and other tools, hope that can help you! good luck!

The firing order is 1-2-3-4-5-6. Let me know if you need more info