I have a 90 f-150 302ci 4x4 what octane do you run. I've been running 91, but filled up the last time with 87 octane, and its really starting to ping.

 

I run the cheap stuff and I have a 94 f150 302ci

 

Same

 

I use the cheap stuff in my truck,I run 93 octane in the sho, and 87 in the interceptor.

 

Our trucks are designed for 87. You shouldn't use anything but 87. If you go higher for awhile and try to come back down you get the ping devil. Going to a higher octane in our trucks is like putting a CAI on our MAP intake systems, pointless.

 

Some advocate "water", applied in the same manner as Seafoam. Personally, I use Seafoam.

You should be running 87 in your truck (if engine is stock) If it can't, you need to determine why. Usually Combustion Chamber build up.

Seafoam "How to": https://www.f150forum.com/f33/how-se...-1991-a-31505/

 

X1000000000000
I like your use of quotes.

 

It "is"...an option!

 

87 octane burns:

• Slower
• Longer
• Is generally designed for low compression engines, "optimized combustion chambers on some newer engines such as the Lincoln MKZ with 10.3:1CR for example, is an exception"

93 octane burns:

• Faster
• Shorter
• Is generally designed for higher compression engines.

Long story short, only use 87 octane with stock 8-9:1CR! If not, you are wasting money because 93 will not burn the entire length of the piston stroke.

 

cheap stuff here too with a monthly dose of lucas fuel treatment and half a can of seam foam every 6 months been doing that for years. great fuel mileage in every vehicle ive owned.