Originally Posted by windswepttom
I tow with a Ford E150 van 4.6L a Kodiak 20 ft 3,900# empty using 87 octane gas. The van is rated to tow 6,400#. It tows OK on the interstate and i can do 70 mph. but it slows down going up a steep hill.
I plan on going to the mountains with it,
Would it help if I used a higher octane gas or added a octane boost additive?
An RV newbie here. But going back to my hot rod days. The simple answer is no, higher octane wont help. Unless..........your van is "pinging" and you engine computer is pulling timing to prevent pinging.
If so, you are losing power. And higher octane might help. You might hear the pinging and maybe not. If your vehicle has a lot of miles, may have a lot of carbon build up and be causing ping. Most vehicles will eventually show a CHECK ENGINE LIGHT if it is really bad.
I used to use a programming piece of hardware and software to "play" with my engine computer. Maybe a Auto Performance shop would do a test for you.
Good luck and have fun.