Originally Posted by david varpness
would it be harmful to use a midgrade gas of like 89 octane in a 91 164 B? im just wondering if this is a bad idea or not with prices being what they are and i dont use the car that much and dont really push it either unless om on the highway which isnt very often or should i just stick with a premium gas?
Short answer: YES it would be harmful. Another short answer, do you think you save that much by running 89?
Calculate it. Not much difference in money but the result if used would cause mucho money for repairs or replacement of engine.
I can't understand why some people search for gas stations with 1,2 3 cents lower a gallon, makes no sense.
Your choice, save a few cents or spend thousands later.
Or run 91 like the manual says, the gas lid says, the gauge says, many posts say and what most modern performance cars need to run.
In San Diego for example 91 is $3.05 (lowest prices) and 89 is $2.98 (lowest prices)
Using 89 would cost you: $44.77 to fill the tank with 15 gallons (assuming you have a couple gallons in the tank).
Using 91 (the proper fuel): $45.75 to fill the tank.
Don't grip over a buck!!
If your going to be cheap, buy a honda you can run 87 in. You will not last long in this car being cheap or neglecting proper maintenance/fluids etc.... Sorry to say.
Hate to see another 164 bite the dust due to neglect, improper use.
One last thing, if your stuck somewhere and all they have is 89 and you need to fill up, go for it but use 91 next fill up.