Nearly all of my driving is on the highway, and I've been averaging 26 MPG or so on Minnesota's E-10 pseudogas. My trip computer says I've got about 390 miles range on a tank, and as I go along, it goes up (adding miles driven to estimated range). The highest total I've seen so far is 427.

I plan trips on 350 miles on a tank. Tomorrow, I leave for a long trip (2000 miles or so over two weeks), and it'll be interesting to see if the numbers hold up.

 

Sometimes, it is not all about the MPG, it is also about how you enjoy burning that gas...

 

Jmaynard, how fast do you drive on the highway?
i do about 80%highway and still manage only about 17mpg. though i do about 90 mph on the highways.

 

I get on the highway and lock the cruise control at 70 MPH (usually; no more than 5 above the speed limit). I have noticed that mileage drops quickly as speed goes up. On one trip where I ran at 75 most of the way, it dropped to about 23 MPG. I've seen 29 when cruising at 65. The average for the long trip, most of it at 70, was 27.3. Computed range has gone as high as 475 miles.

 

We usually get about 300 miles on 3/4 of a tank, and refill with 15 gallons. Currently averaging 21-22mpg on 89 octane. Tried both 87 and 92, didn't break 20mpg on any single tank.

 

I usually see about 350 when I refill. I average 24 mpg highway with the 10% ethanol crap and about 26 when I am away from the metro areas and use the real gasoline without ethanol.

I wonder if anyone ever did the math that would show that you have to use more gasoline with ethanol in it to go as far as you would with pure gasoline. I wonder which really pollutes the air more, especially when you add how much CO2 (>8 lb/gallon) is released when ethanol is produced.

Kind of odd now that everyone is concerned about greenhouse gas and global warming, and here we are rushing to produce tons of CO2.

Back on topic. The computer range is seems to adjust based on your driving habits and the mpg that is being calculated.

 

My wife who i think has a lead foot averages about 13litres/100km. She does mostly highway driving, so this is really bothering me.

90% of her drive is highway and we're only getting 430km a tank before the light comes on. That's about 267miles.

 

Wow, that's a bit low...you have to get a least 20 miles/gal, it is a 19 gallon tank, so 380 miles or at least 350 miles.

 

13 liters per 100 kilometers is about 18.1 mpg. That's 343 miles in a 19 gallon tank. My fuel warning light comes on with 3 gallons or so left;that would have the light come on at 290 miles.

 

yes, so I think that' awfully low.

 

This weekend I went to Tahoe and back (just over 230 miles each way) and filled up twice. Each time the range estimator read 300 miles...obviously pessimistic. It was, as expected, very slow in counting down the miles. Even with conservative estimates (22mpg x 16 gal) I'd expect it to read > 300 miles. And since I averaged 26.2mpg on the way up and 28.1mpg on the way back, I did expect to read higher. Kind of interesting. I was really pleased with the mileage, though. I behaved and kept it between 60 & 70mph, but still...climbing 6,800 feet over 230 miles and seeing 26.2mpg made my happy.

 

I need to do a longer road trip. I went to Savannah last weekend and averaged 24 mpg. Not bad, but I want to see 26.

 

Did you fill up with the same gas formulation each time? I had occasion a few months ago to drive about 300 miles down to South Texas and return. On that run, altitude is no real factor. By the computer, I averaged 22.8 on the E10 premium blend, and between 27 and 28 on the straight premium gasoline. I'm going to confirm these figures with a similar trip in the other direction next week, but I expect the results to be the same. Ethanol may be clean, but it takes a good bit more of it to push you a mile.

Whole story here:
https://www.clublexus.com/forums/sho...d.php?t=269112

 

In fact I put in Premium....for the entire 900 mile trip.

 

Same here. 91 octane only. I'm back at what I'm guessing will be consistent mileage for me - 22.8mpg in roughly 60/40 highway driving. If it stays close to that figure I'll be very happy.