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Old OE thermostats on Japanese cars will fail open. Before they fail they get lazy about getting up to operating temp. I think on the VX the gauge should read just below halfway, and it should get to that temp in less than two miles.
Idle speed should be 550 RPM.
Low operating temp will make the car run richer to compensate for colder temp. Before you buy the cheapest, check the OEM (read dealer but search the net for better price) and make sure the difference in price justifies the cost in mileage and possibly having to change the stat more than once.
Best ever mileage on my 94 was 68 MPG all highway at 60-64 MPH, 4.637 gallons of fuel for 300 miles. Many here did not believe it. The car was absolutely original everything, even tires made in 1993 and that mileage was from June 2008, on 15 year old tires. When I finally replaced them with Michelin X (on sale) myaverage MPG dropped by 7.
My 94 was a time capsule, bought it in March of 08, it had been totalled in 1995-6 then stored in an insurance training center for 15 years and used to train adjusters.
It had 27,492 miles on the odometer when I got it and it was original down to the wiper blades.
regards
Mech
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