jmc921
Senior Member
- Joined
- Jul 16, 2018
- Posts
- 116
- Reaction score
- 75
- Location
- Dallastown, PA
- Ram Year
- 2014
- Engine
- 5.7 L Hemi
Most of what I’m reading about 87, 89 and 91 makes no sense. The difference in these fuels is their resistance to knock. All of the fuel grades from a particular brand have the same detergent levels. The idea that “blended 89” is the worst of both worlds is just plain foolish. Having too high an octane rating (91 when you only need 87 or 89) only means you will not see any benefit in power from the higher octane gas. There will not be any increase in “deposits” since it will burn just as completely as the lower octane gas. Bottom line, you should feel more power with the Hemi using 89 instead of 87 but there shouldn’t be any difference in wear or deposits.