911LE

On a road trip with my '01 and was amazed at the gas mileage. Filled up in Flagstaff, AZ and drove through to Utah averaging about 75mph with speeds from 65 to 80, climate control set to Auto 74 with the ac on. For the first 100 miles the trip computer said the tank average mileage was 37 mpg. It slowly dropped to 30 mpg over the next 75 miles. The terrain seemed flat overall with many ups and downs. Adding the miles driven on the tank to the approximate range gave me 620 miles. Ended up averaging 27 mpg on the tank but when I refueled the computer said my range was over 670 miles. Pretty amazing for a 130k mile '01 with the 5 speed transmission and ride as smooth and quiet as can be.

Johnhav430

Nice! I like to shoplift the highway mpgs myself so to speak....meaning since the car automatically keeps the tank avg., if I'm going to be on the highway for an extended period, I reset the mpgs at cruising speed (I will still know the tank avg per the car anyway). It seems to gravitate towards 27.x....sometimes 28.x......but at best, I've seen it go as high as 31.x for a while, but never as an overall avg. Again, to be valid, I like to cruise for at least 100 miles without interruption, and the LS has delivered back 28.x, which I'm satisfied with because I think the epa was adjusted to 23?......(why I crack myself up is that's fair to poor by todays standards, but excellent by ours lol)

2KHarrier

That's impressive mileage. The best I can do is usually around 570 Miles on a tank. My '01 is pretty much only used for the commute to O'Hare every day, so it's 76 miles in the morning and 76 miles in the afternoon. I've seen an AVG for the tank as high as 27, but that includes the small amount of city driving I do with the car. Keep in mind, I tool along at about 68-70 mph everyday as I'm more interested in mileage than speed of trip. I've averaged as high as 31 on a drive home, but there are a lot of elevation changes that effect the average.

Duck05

My observation is the built in "computer" that displays MPG and range on a full tank tend to be optimistic over the "old school" paper and pencil calculations made between fill ups. When the '01 was the wife's daily run around town driver the routine MPG was 18-21. When I took It on as my daily with a very long daily commute I got 23.5 to 25. Not sure if the CA emissions and fuel mixes curtail MPG or not but getting any where near 30 MPG is quite an accomplishment (if done with math and not the readings on the display...).

Johnhav430

Interesting, we have 3 cars with mpg computers (I was fascinated the first time I saw one, in 2005, in a Chevy Cruze rental). A German car, a Japanese car, and an American car. The American car is way off--pessimistic. My buddy said the same thing of his Lincoln Navigator, and our car is GM.

The BMW is exact. Like it or not, every time I manually calculate, it's down to the tenth of a mpg. Once in while, it is off by .1.

The Lexus "does" tend to be optimistic, by about .3 mpg on avg. Of course we could get into the use the same pump subsequent times, and let the pump stop on its own. But since I do NJ full serve, it's hard to do that.

Why the American cars are off in my limited experience must have to do with how it extrapolates the gallons consumed--none of the cars measure fuel flow.....my .02

But I enter all the numbers (price, odometer, gals consumed) in android, and the gals is by the pump....

2KHarrier

I use fuelly.com and track my fuel usage. It's actually very close to what the computer is calculating. Usually within .4 more than what the website states. Close enough for me anyway...

biggieB15

iTrader: (1)

I get around 350 miles on a full tank driving it in the city, I just bought the car about a 2 months ago and still have not taken it in a long drive to see what mileage I get

911LE

Just finished the 2160 mile road trip and averaged 26 mpg overall. Speeds increased as did the winds and hilly terrain as the trip went on. On the last fill up the computer told me 676 miles of range which I knew was overly optimistic. Only issue with the car was a check engine light for running lean on both banks. My car throws this code every time I do an extended drive at 80+ mph. Otherwise she ran great. Here's a pic I snapped at sunset at the cemetery in Bluff, Utah

Scootymad

I can't get 670km out of a full tank, let alone 670 miles, even on the highway on premium pump gas with no ethanol mix. How you guys manage that is astonishing

Johnhav430

I'm not used to it, but me too (usually need to refuel sooner on the other cars). Since the car takes premium, I go to Costco, as it kills two birds. One, cheap, two, top tier. But it's a little out of the way. Since I tend to get 19.x, I'm right around 370-390 miles by the time I get there. The fact that this tank is maybe 3-4 gal larger than many cars, is very convenient, if it were say 18 or 18.5, I'd have to go to Costco sooner and more often. They did this one right. Just not sure why the epa is 16/23, usually, epa ratings are overly optimistic, not the other way around...(that's the nature of self-reporting and no verification--a man's height and salary are a good example)

2KHarrier

For me it's fairly easy. I live roughly 3 miles from the freeway entrance, and when I get to O'Hare in Chicago, I drive another 2 miles to the parking lot at our hangar. So, 95% of my 76 mile commute is on the expressway. I don't usually speed, as it's not worth the risk and I tend to hang in the right lane, to keep out of everyone's path.

It's pretty easy to keep this boat at or near 30 mpg when you want to... I'd like to know how some of the guys are hitting close to 600 miles on a tank. Mine is a 2001, so perhaps the 04-06 models get a little better mileage? I haven't experienced that with my 05, however. But I really don't drive it much.

911LE

I only got 506 miles out of the last tank. The computer said the tank average was 26.0. By my math I got 25.2. I would have to do better than 33 mpg to get the 670 mile range the computer predicted on the full tank. I don't think that's possible unless it was downhill the entire tank.

5t341th

iTrader: (16)

Hmm. I only get 260 miles a tank...

lexman52

I don't understand how u guys get that kind of mileage when the manufacture says 18 to 25 mpg. I get about 380 but I do not wait for the low tank light to come on. Highway is 24mpg. I find it very difficult to believe some of the mileage u guys get.

Johnhav430

670 miles, if one drove until the tank ran dry, would be 30.45 mpg. I'm not able to achieve that over 670 miles. I can get 30.45 if I were to cherry pick a 14 mile trip that's much downhill on the highway, but not over a tank, so I'm not worried. If this were a new Mercedes S or something, sure, 30.45 is doable, but then again the car is also 12 years newer....the other thing is I think OP saw 670 on the range, he didn't say he actually drove that far on a tank, so who knows what the algorithm for the range is defined...