If there is one mistake I have made, one rather careless act towards my land rover, it was to use regular gasoline. However I never really understood super or premium gasoline other than the price tag! Yes I have briefly looked around the recent pages and found no mention on this topic so excuse the post if its been asked 1000 times. But what is super and premium gasoline, and what is the big difference between using regular vs premium in a land rover?

 

read these, if you have any questions come back and post.

https://landroverforums.com/forum/di...uestion-39047/

https://landroverforums.com/forum/lr...asoline-38420/

https://landroverforums.com/forum/di...ium-gas-37902/

https://landroverforums.com/forum/di...lar-gas-37680/

 

Mostly speculative opinions, but I think I got the point. I'll go with premium. You wouldn't have the link to that seafoam sticky would you?

 

This topic cracks me up every time. some threads may be based on "speculative opinion" but the facts are facts and not opinion.

Google is a helpful tool... so is the "search" feature of this site... try it.

This is a very simple description copied from wiki...

"Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause autoignition. (called knock or pinging)

It might seem odd that fuels with higher octane ratings are used in more powerful engines, since such fuels ignite less easily. However, an uncontrolled ignition is not desired in a spark ignition engine.
A fuel with a higher octane rating can be run at a higher compression ratio without causing detonation. Compression is directly related to power and to thermodynamic efficiency (see engine tuning), so engines that require higher octane usually deliver more motive power and do more work for a given BTU or calorie of fuel. Engine power is a function of the fuel, as well as the engine design, and is related to octane rating of the fuel.

A common misconception is that power output or fuel mileage can be improved by burning higher octane fuel than specified by the engine manufacturer. The power output of an engine depends in part on the energy density of its fuel, but similar fuels with different octane ratings have similar density. Because switching to a higher octane fuel does not add more hydrocarbon content or oxygen, the engine cannot produce more power.

However, burning fuel with a lower octane rating than required by the engine often reduces power output and efficiency one way or another. If the engine begins to detonate, that reduces power and efficiency for the reasons stated above. Many modern car engines feature aknock sensor – a small piezoelectric microphone which detects knock, and then sends a signal to the engine control unit to retard the ignition timing. Retarding the ignition timing reduces the tendency to detonate, but also reduces power output and fuel efficiency.

Most fuel stations have two storage tanks (even those offering 3 or 4 octane levels), and you are given a mixture of the higher and lower octane fuel for the intermediate grades. Premium is fuel from the higher octane tank, and the minimum grade sold is fuel from the lower octane tank. Purchasing 91 (where offered) simply means more fuel from the higher octane tank than purchasing 89; the detergents in the fuel are often identical. But for some producers, the additive package is different between the higher and lower octane rating."

The $0.10 you may save per gallon on 87 WILL lead to decreased MPG's, decreased performance and premature deposit build up on your engines internal components. Feel free to "fight the power" and put in the gas that engineers and real world testing by consumers has proven to be less beneficial and more costly. I won't.

 

try it out firsthand. run 87 in your truck and report back to us. in the meantime i will run my truck on premium.

seafoam for the induction cleaning? all you need is an adjustable wrench a piece of tubing and a can of seafoam. some cans of seafoam come with the tubing already. just stick in in the SAI input, start you truck and let it trickle into the engine. once the can is empty turn the truck off let it sit for 30 mins start it up and let the smoke fly out.

 

Which vacuum line do you use? I bought 2 cans when I was doing the 60k but ended up only using 1, pouring it in the gas tank. I couldn't figure out which line to use, can somebody post a pic?

 

In layman's terms.."octane" is a measure of how fast a fuel burns (cetane..for diesel ) . It is backwards of what you might think ..as a higher octane fuel actually burns slower than a low octane fuel.
If you can imagine a piston coming up to compression in a cylinder..and the fuel charge burning too quickly for that engine due to a lower octane fuel ( before the piston is in proper position to make best use of the combustion) the resulting combustion will hit or "knock" the top of the piston too soon and result in a loss of performance and the knocking or pinging you may hear. A higher octane fuel in the same engine would burn slower and be better timed for optimum performance. Unfortunately for our walletts, Rover engineers designed a setup the requires higher octane fuel.

 

No free pass for you on this one....

Tech section at top of Discovery 1 tech forum page..... Sticky like the sticky icky u b 'mokin.


*** Well WTF?*** EDIT**** this http://www.landroverclubvi.com/seafo...procedure.html used to be in there anyway. Spike, Mike or to whom it may concern, since this is a popular question can it be added with its own link instead of burried somewhere...please.

 

LOLOLOL I do look before I ask..sometimes.
Thanks! I got your PM too haha.

 

You can read all the write ups you want but, when it comes to the real world and our Rovers, driving on 91 plus octane runs the engine cooler, gives you about 1.5 MPG better millage and prevents carboning up your valves.
So base your decision on this and not what other manufactures say about their tests on their vehicles cause what really matter is our Disco's.