The website below will give you the black book value for the 2005 Toyota Echo and provide you with the list of all used 2005 Toyota Echo's on the Canadian market as well as their selling prices and respective mileage.
http://www.canadianblackbook.com/
You can also use Phil Edmonston's Lemon-Aid Used Cars and Trucks book to evaluate your purchase of the Echo. Phil has rated the 2000 - 2005 Echo's as a Recommended Buy which is his highest rating. You can borrow a copy of the most recent edition of this book from your local library if you want to do more research.
The Echo is a very dependable vehicle and extremely fuel efficient. As per Natural Resources Canada's ratings (see link below):
http://oee.nrcan.gc.ca/transportatio...gs-results.cfm
2005 Echo: 7.1L/100Km (City) and 5.5L/100Km (Hwy).
Mileage isn't as important as the maintenance of the vehicle.
It's a bonus if the car has been rustproofed on an annual basis (Krown, Rust Check, etc.).
You can also go on to:
http://www.tirerack.com/
and check what people have to say about the tires that are currently on this car to determine if you're paying a premium for better tires.
The condition of the tires including tire depth will determine when you'll be buying a new set of tires and will have a bearing on the price that you'll be paying.
Your posting doesn't state whether you'll be getting a set of winter tires in addition to all-season tires. If rims are included with the extra set of tires, then you'll be paying extra for these features.
You can also purchase a detailed Vehicle History Report at:
http://www.carproof.ca
You will need to provide the VIN for the car.
The cheapest report will provide you with the following information: Cross Canada "Live" Registration Check, Canadian Registration History Data, Accident Claims data from Canada's private and public insurers (excluding B.C.), complete U.S. history (if any) and Odometer Records (verifiable sources only).
There are additional charges for the ICBC Vehicle Claims History Data, Cross Canada Enforceable Lien Search and Import Records from Canada’s R.I.V.
If this is a private sale, it's also important to get a mechanical inspection done.