![]() ![]() ![]() i've been meaning to buy a new fuel filter, might help things out. My 93 usually gets about 22-23mpg in steady 70+ highway driving. I inflate my tires more than most since I hate how mushy 30psi or whatever they call for feels, I run a good synthetic oil, and I keep on top of all the maintenance items. Despite the gearing, I get great hwy only mpg, 27-28 mpg with the a/c on, and I always run 5-10 over the 70mph limit. Sounds like you might need a tune-up if you are getting less than 23mpg. I believe the Gen I cars run a little faster than Gen II, but my '99 runs. I've had 4cyl and 6cyl rental cars that don't come close to the rpm range that the LS does on the hwy, and they did just fine running the rolling hills we have here. ![]() How fast does the LS400 rev on the highway? Any other suggestions to get better mileage?I'd love to ask the engineers of the car why the revs are so damn high on the hwy. absolutely the most economical on the lake by quite a bit. most likely due to no intake and minimal resistance on the exhaust. In fact, I have the Toyota boat with the very same 4.0L V8 but rated at 300hp. I see others are getting better economy with their similar year LS400's and wonder how they do it? I put in a higher flow air cleaner but no difference. It has the options in the back seats to entertain my teenagers and let me drive. Car only has 43,000 miles on it and is like new. As such, I am only getting about 23 MPG on a Canadian gallon. My engine is revving about 2450 RPM at 70 mph. I recently purchased a 1992 Celsior and I believe it has a lower gear ratio than the LS400. You might even introduce unintended problems by opening up the rear diff. I can't imagine that changing your rear diff ratio from 3.917 to 3.615 would help your fuel economy enough to be worth the effort. It's hard to believe I've held on to that magazine issue for 20 years - it led me to buying my first LS400 a few months later. spec LS400 had the following transmission gear ratios: I'm kind of a Mercedes buff (even if I wouldn't buy one anymore) and see in one of my books that, for example, the 300SL roadster produced from 1957 to 1963 could be ordered with the standard 3.64 rear diff or with an optional 3.25, 3.42, or 3.89 rear diff.Īccording to a November 1989 Automobile magazine article, the 1990 U.S. If you are old enough, you might remember when cars could be ordered with a huge variety of final drive ratios. The following isn't the best webpage but I found it in a quick search - it has formulas for calculating RPM: Doing these calculations are probably more common in the track racing world. It should be possible for you to calculate RPM for any car at various mph/kmh for any transmission gear and final drive ratio combination by using simple formulas. I doubt if I got on a highway and exceeded 45 mph during the period in which the 00 LS got 15.9 mpg - it was all stop and go driving. Fuel economy in mixed city/highway driving is much worse - mileage at the past five fillups were: 21.8 mpg, 20.6 mpg, 22.8 mpg, 21.1 mpg and 15.9 mpg. The 2000 has just barely exceeded 30 mpg only once on a highway trip from Tulsa OK to Kansas City with a very strong tailwind - gusts to 50 mph. gallons) in highway only driving in low wind conditions with the car fairly lightly loaded. My current 2000 LS400 with its 5-speed transmission and better aerodynamics gets substantially better fuel mileage that my 90 LS did - it averages 26.7 to 27.3 mpg (U.S. I gave the records to the 90's new owner so I can't give you the exact figures unless he (Toby?) happens to see this post (he is a forum member and also has a GX470) still has the maintenance/fuel log I gave him and provides the information. Typically, the overall fuel economy was much, much lower - probably 17 - 20 mpg. I tracked every drop of gasoline that when into my 1990 LS400 from new until I sold it at 183,000+ miles and it approached 25 mpg in highway only driving only a few times and only because of a rather stiff tail wind. I have to laugh when I read claims of typically getting 30 miles per U.S. These are all new to me as I had never been in one before I purchased this one.Ĭan you let me know how fast your LS400 is reving at highway speeds? Ours is considerably larger and I am only getting 23. I see guys claiming nearly 30mpg on a US gallon. I can't think it will change the mileage that much. I will talk to my mechanic here to see how involved it is to change the ratio. not necessarily good for me, but it is good to know. ![]()
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