Yes, if the engine is in good mechanical condition and has no visible leaks.
The mileage on the odometer is somewhat irrelevant. It is more important to know how well the car has been routinely maintained and what if anything has been replaced (a new engine or transmission can add a lot of life to an older car).
If were talking about a 3.5l engine from chevy, then yes. they put allot of money in testing this engine and gave it good gas mileage horsepower and torque.
Per the manufacturers recommendation, I would go with a high performance synthetic oil in either a 5W30 or 5W40viscosity (even taking into consideration your 60k mileage). One of the best synthetic oils is Amsoil, and they make a 5W40 oil specially formulated for European vehicles. The downside is that Amsoil can be hard to find at local stores. Redline is another option, they make good quality synthetic oils as well. At the very least, I would use Mobil 1, which is relatively easy to find at most stores.
It depends what year the car is, how good condition it is in, and what engine the car has in it. If it is the V8 engine in the older models you can expect lower gas mileage. With my 4.6L V-8 I get around 18MPG. The V-6's are probably better on gas.
A Ford Falcon gets similar gas mileage to other vehicles. The gas mileage is around 30 miles per gallon. Older Ford Falcons were not as good on gas as the newer Ford Falcons.
About 12 city/15 highway with a good running engine.
i use amsoil in my 450.i love it Amsoil and Mobil are both really good brands. It also depends on what you use the car for. If you like to drive fast? Rev-hard? Drag race? drive in intense heat? Want your engine to last longer? don't want to change your oil as often? then Amsoil is the way to go. the quality of oil is much, much better.then Mobil. but if you're performance minded like me... Amsoil has a large variety of different oils and viscosities. http://www.synthetic-motor-oilsite.com/1626253/ the site
Two good parts for a 1998 Dodge 1500 with a 5.9 liter engine that increase power and mileage are high performance air and fuel filters.
5.4 v-8 is about 13-16 miles a gallon with tires in good condition & engine running normal.
Average mileage on used scion car is 25000. They are good cars which are made by Toyota which actually owns this company and brand. Buy a scion for style and engine.
If the engine is high mileage yes, replace the head bolts. If it is low mileage it is your choice, but is always a good idea to replace them.
With the 4.0L engine, 16 - 17 city, 21 - 22 Hwy.