Down in SETX we have 87, 91, and 93 octane fuels. If I was up in the Dallas area I've seen 87, 89, 91, and 93 octane offered. Just funny how it's 1.00 or more per gallon for 93 in my neck of the woods where fuel is basically made, but in the places it has to be sent in Tankers it's only .25 to .40 more per gallon... Makes absolutely no sense to me!

 

This engine is designed for premium and I use 91 always, rarely come across higher octanes at pumps. 89 is cheaper but makes gas mileage worse. In the end of the day buying premium is not that more expensive.

 

Always the highest grade, 93. The only time I used grades other than that was when I was driving cross country and some places did not have 93 in stock. Here is the way I see it. The car's paid off, it is a V8... I mean it is better than having a car payment on a 4 cyl car that I would not drive now anyway due to the work from home policy ;-)

 

141k miles here, PCV mod, otherwise stock. Rotella T6 15W40. T-case and diffs filled with HD 75/140 synthetic.

I use 93 octane from any name-brand gas station (Shell, BP, Exxon, etc.). At every oil change, I throw a can of BG 44K in the tank.

This weekend I drove 340 miles round trip going 80 most of the way out to the lake. Disco was loaded up with crap in the back, had my wife and daughter on board. According to my Scangauge I was getting about 20.2mpg (and 175* coolant temp). This board steered me in the right direction on this stuff, I won't mess around with anything else.

 

Interestingly, the octane standards for gasoline (regular/midgrade/premium) are regulated at the state level, which is why some people in this thread are talking about using 93 while others say they've never even seen it. Generally, the western half of the country has minimums of 87/89/91 respectively, while on the eastern half, you're more likely to see 87/89/93. In Colorado and Utah, regular grade gasoline is only required to be 85 octane.

I usually use 93. Seems like cheap insurance and protection against knocking.

 

At DCDisco2, Keep in mind you are not and can not get 20mpg in one of these... The scan tool has no way to real time measure MPG... It can only do math on user input data and odometer readings, which are most likely incorrect.

I don't know about everyone else but with larger tires my Ultragauge is wrong on both mph and miles traveled. You have to use a gps app or similar to accurately measure your speed and thus odometer reading.

The only way to get a correct mpg reading is the old fashioned way... Math, using known accurate data... not OBD2 port data.

 

I did the research all we need is 91, which is what I run. 91 at least in western Canada has less ethanol which at least for me translates to better performance and mileage even in my old R50 pathfinder the brand with less ethanol were better

 

Maybe so, but I fastidiously update the fuel consumption in the Scanguage with every fillup, so it's probably less far off than you'd think. Since Land Rover quotes 14mpg highway for the 2004, I'll assume it's close to that.

 

Best I've ever gotten was around 17 highway... But don't kid yourself the scan gauge can be "that" far off... I've done the tests. Out on the highway with a GPS unit for speed and actual miles. I have a familiar route, 122 miles between two gas stations on the freeway. mostly level with a few hills... Distance between two points verified on google maps as well as with GPS app. Fill at one end, drive, fill again, do math.

I've also tested with the GPS between mile markers on a deserted section of highway using a stop watch and a GPS going 60mph. Found out the gauge cluster reads one thing, the UG reads another thing and the GPS reads different than both, so YES, your data may be farther off than you think. You will not know until you do the tests yourself. Trust me neither your cluster or your scan gauge is spot on. IF one is, it is purely coincidence.

Do yourself a favor and do the tests. You are probably between 15 and 17 highway doing 70 mph.

BTW my odometer and UG were off before I installed one size larger tires. The larger tires just changed the amount both were off. Did not make it right, it never was correct.

 

i run 93 octane in all my Rovers consistently and 91 when i can't get 93.

i get my best performance (ha!) and MPG (again, ha!) when i can find non-ethanol 93. this is usually only when i'm traveling out of state.