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Re: Which grade gasoline to use? 700 1988

posted by  someone claiming to be James A Sousa on  Sat Nov 10 15:09 CST 2001 [RELATED]

While it is a truism to tell someone to use the lowest octane that allows your car to run properly, what is properly?

I suggest that you try several tankfulls of each grade while on a trip.

We did 4996 miles traveling from Massachusetts to Saskatchewan (scratchy bum to natives) and back along a different route, and noticed a loss of almost five (5!) miles per gallon on regular with our 740 wagon (140k miles)

My Haynes manual tells me that the first thing that happens when a knock is sensed is the addition of more fuel! This stops the knock quicker than changing the timing.

Also, consider the changes that take place in an engine as it gets older, such as carbon build-up, running hotter, loss of efficiency of ignition and fuel systems, etc.

For the price difference, make mine high-test.





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