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Regular vs Premium gas - what's the consensus?

14 messages,  Last post on Jul 25, 2007 at 1:13 PM

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What is this discussion about? Land Rover Discovery Series II, Land Rover LR3, Fuel Efficiency (MPG), SUV

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#5 of 14 Re: Regular vs Premium gas - what's the consensus? [british_rover] by maxcattum Oct 19, 2006 (4:29 pm)
Replying to: british_rover (Oct 17, 2006 6:06 am) Are the compression ratios for the Disco I 4.0 L engine and the DISCO II 4.6 L engine similar? Since I've been "successful" running my DISCO I on 87 Octane, I'd like to do the same with my DISCO II. I'm not towing anything - this one is mostly for cruising and city (my DISCO I is my offroad toy - can't get any decent resale value for them these days, so I may as well keep it).   Thanks for your feedback - MaxCattum Replies to this message: british_rover (Oct 20, 2006 5:18 am)
#6 of 14 Re: Regular vs Premium gas - what's the consensus? [maxcattum] by british_rover Oct 20, 2006 (5:18 am)
Replying to: maxcattum (Oct 19, 2006 4:29 pm) I will look it up for you and let you know. I just got to find one of my old Disco tech books.
#7 of 14 Re: Regular vs Premium gas - what's the consensus? [british_rover] by lrguy44 Oct 21, 2006 (10:47 am)
Replying to: british_rover (Oct 17, 2006 6:59 am) Here at altitude (above 4000 feet) it has been common practice to use Regular (85 octaine) for years. It was even in a owners manual for a 97 Maxima that I had. Read an article somewhere that it was not recommended anymore, but dealership and customers have not had problems. By the way Rover - I was off 3 1/2 months medical but had to come back in time for Master's cruise. Replies to this message: chomondely (Oct 27, 2006 7:06 am)
#8 of 14 Re: Regular vs Premium gas - what's the consensus? [lrguy44] by chomondely Oct 27, 2006 (7:06 am)
Replying to: lrguy44 (Oct 21, 2006 10:47 am) 2006 LR3, V6, 10k miles. I live in Houston, Tx, sea level fairly level. I just switched to regular gas. I get about 19-19.5 mpg with regular, the same as premium. Mostly highway, 73 mph. I would switch back to premium if I towed a trailer or needed full throttle acceleration. No drivability problems at all with regular.
#9 of 14 So ... by hdominguez Nov 14, 2006 (9:45 pm)
Based on the feedback from the guy from Houston ... is it ok for me to use regular gas for an 05 LR3? I don't want to do it if this will cause long term problems or issues.   Hector Austin, TX.
#10 of 14 Does it really matter? by bobw3 Nov 17, 2006 (6:30 am)
Does it really matter? Normally premium gas is $0.20/gal more than regular. If you drive 20,000 miles/year at 25mpg, that's 800gal times 20 cents a gal more = $160/year, or about $3/week more in gas costs, or 0.01% of the cost of buying a $30K vehicle...we're not talking big bucks here! It's about the difference of getting 23mpg vs 25mpg using 20,000 miles/year at 25mpg = 800gal vs 23mpg = 870gal which is about an extra $160/year.    So you could look at the difference between using premium and regular gas the same as gettin 25 vs 23mpg, but for some, that difference is enough to buy another vehicle. I guess if everything else were equal between two vehicles except one costs $160 more per year to operate because it's less fuel efficient or requires premium gas, then I'd go for the one not costing the extra $160/year, but there are usually a lot of other differences between vehicles (in my opinion) more significant than this issue. Replies to this message: maxcattum (Nov 17, 2006 11:35 am) british_rover (Nov 17, 2006 11:52 am)
#11 of 14 Re: Does it really matter? [bobw3] by maxcattum Nov 17, 2006 (11:35 am)
Replying to: bobw3 (Nov 17, 2006 6:30 am) Interesting analysis and point taken.   Unfortunately our Discos don't get 23-25 mpg but rather 12-14mpg. Being in California, the delta between regular and premium is more along the $0.35 / gal. So we're looking at $400-500 / year. My question was: can I pocket that without damaging the engine in my 2003 Discovery? (I know I'm ok doing that with my 96 Disco - have been driving on regular for 8 years without problems)   Thanks for all the replies - looks like nobody has had a real bad experience going that route.   MaxCattum Replies to this message: british_rover (Nov 17, 2006 11:52 am)
#12 of 14 Re: Does it really matter? [maxcattum] by british_rover Nov 17, 2006 (11:52 am)
Replying to: maxcattum (Nov 17, 2006 11:35 am) I know plenty of people that put regular in their Discos and the only consequence seems to be a tiny drop in MPG.   Try it out for a few tanks and see how your mpg drops.   The knock sensor will retard timing if necessary so that should protect your engine.   If you are going to tow or use the Disco off-road you should put premium in it as you are straning the engine more.
#13 of 14 Regular vs Premium - the real difference by 55396 Jul 25, 2007 (1:13 pm)
Here is a very good explanation of octane ratings in fuel and how it has nothing to do with the energy content or quality.   http://tech.vtxoa.com/index.php?action=artikel&cat=3&id=22&artlang=en

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