I finally took my car for a long road trip last weekend. Well, to me, a trip from San Gabriel Valley to Vegas is a long road trip.
I top off the gas when I started the trip on Saturday noon. I got there after 250 miles and it's only just a little bit below the half mark on gauge. We stopped once for restroom break and got to Vegas in 3.25 hours. That's average about 75 mph. I was constantly between 85 and 100 mph.
Before driving back on Sunday, I fill up 7 gallons. I came back with moderate to heavy traffic from Vegas to Barstow. I average about 50-55 mph. In several times, I hit 115 mph. Man, I am telling you, the car is very quick from 80 to 110 and very stable.
Sunday nite, I went to Beverly Hills for Mother's Day dinner and after that fill up my car.
That a total of 577 miles and 23.5 gallons. That's average 24.6 mpg. Not bad for constantly driving in high speed and some traffic.
Btw, my normal combined city/highway is between 18 to 20 mpg.

 

Not bad for the speed you were doing.....Just think what you'd get if you travelled closer to the speed limit......
C.

 

Sounds pretty good to me. That's about what I get driving at 70-75 mph.
My normal combined is around 16.5-19.

 

Sounds better than average considering the speeds you were traveling. Good to see the car is capable of getting reasonable numbers - I've been averaging 22 MPG with mostly a city mix. I don't drive as fast as you though.

 

Driving around in Dallas I've found my G getting around 20 mpg constantly. Now with Gord's GG I'm not sure though. I think it's better than that.

 

I just hit 25.1 MPG in my last tank driving from Seattle to Portland and back. I put a lot of miles on my car as an outside salesman, but I've been getting a steady 23-24 MPG since the 2nd tank of premium fuel.

You have to understand that most of the people who say they're only getting 16-18 mpg are doing "mixed" driving. Do you know what mixed driving translates to? It translates to city driving!!! In most cases, they're not mixing at all. Just because you get up to 65MPH on the freeway during 40% of your commute, that doesn't constitute highway driving. If you want to achieve the highway MPG numbers, you have to drive over 75% of the tank at steady speeds of 50MPH and above.

 

EPA Highway numbers require 55-to max of 60.5 mph steady no AC no hills........the test proceedure is very very specific.

Test hasn't been updated to reflect that people use AC and drive faster than 60.5 mph......because mpg would suddenly have to be reclassified downward by 3-5 mpg to be reprentative of how people really drive now!

"When the EPA tests cars and rates their gas mileage they don't actually drive on a road. They use a device called a dynometer. They use the exact same pattern of driving that's been used for every tested vehicle for over 20 years. The "city" portion is nothing like what most of us consider city driving...there are many stretches of 1/2–2 miles at 21mph. And although there are many stops built in there is nothing like the stop and go driving of a real city. Thus, many people in 'real' cities don't see anything like the city mpg numbers.

The highway test portion is equally outdated with an average speed of 48mph. For those of us who use the interstate transit system in the US and know that posted limits of 70mph are, in reality, minimum speeds with most vehicles in the 75–80mph range this portion of the EPA test is equally unrealistic.

To further exacerbate the issue of innaccuracy with 'real world driving' the EPA tests all the cars in a temperature and climate controlled building at 68–86 degrees fahrenheit with a vehicle that is already warmed up (highway only, city portion is cold start) and A/C turned off. It assumes a flat level road (ie no hills). It measures exhaust CO2 to determine how much fuel was used."

http://www.fueleconomy.gov/feg/how_tested.shtml

 

This is the first time that I drove that fast in the G. It was also fun that a new Maxima, an E320 and I were following each others to pass the slower traffic. The Maxima kinda got frustrated because he couldn't pass me. Everytime he starts to tailgate me and then I'll switch lane and he got stuck behind some slower cars....