John, Have you compared your dash reading to your calculations?
I do this on a regular basis and it's constantly within 0.1, so I trust the reading on the dash to be close enough for me.

Have you found yours to read differently?

Also, keep in mind that I average 19 mpg, not 30.
The pic I posted above was to shut up some guy on the Edmunds forums who insisted it was impossible for me to average above 25 mpg with my 50/50 city/highway commute. I proved him wrong, but it was the most boring drive to work I ever had.
I'd much rather enjoy my ride and get 19!

29 mph is definitely credible in this car on the highway below 60. I routinely get about 28 mpg at 60 and 26 mpg at 70 on the highway with no stopping, I get between 24 and 25 mpg during my 70 mile per day commute, which is 20% heavier traffic and 80 % highway at speeds between 55 and 80 mph, depending on who is in the left lane in front of me. The key to higher mileage is to brake as little as possible since the brakes turn your hard-earned gas money into heat (Therefore in city driving - your f#cked in any car since cars are not designed for city driving). Coast and don't come to a complete stop unless you absolutely have to. My 6 spd sees a lot of time in neutral going down hills. Enjoy your fuel savings for burning rear tires, lower gas bills or more beer.

I agree about not braking as much as possible. As soon as I see a red light, I take my foot off the gas and coast.

However, I'd suggest leaving your car in gear when going down hill. Reason is if it's in neutral and coasting the car's computer has to keep the fuel flowing to the injectors to keep the engine running. Whereas if you have the car in gear when going down hill, the car's speed will keep the engine running and in that condition, the engine will not need fuel to keep running..

and my avg MPG for today is,,,...

Honestly, Aeson, I've had those computers in other cars, and they've always been so far off that I've never paid attention to the one in the G. I suppose a granny-like drive at below 60 might get the car near 30, but I'd rather walk than drive that way.

I average anywhere from 15-22, depending on my right foot's behavior during that tank of gas. I generally spend my highway time between 75-80 mph, and I average about 20 mpg at those speeds.

As an aside, nice job on the plate frames.....I got mine a couple of days ago

On my last tank averaged 25.1 mpgs and got 400+ miles

Just returned from our 1700mile Vegas round trip and avg'd 25.5mpg hwy going 80mph. Usually get around 20 in town, NO COMPLAINTS!

The average my car computes is always within .15mpg of actual. I always fuel at the same station and trust the readout.

Did that for a little bit the other day. Cruising at 65 mph, may have been 70 mph. But then I got a bit bored and started flooring it so it dropped a little.

I tried my best to get the highest gas mileage on the previous full gas tank. But the number does not please me. I got 18.4 mpg in city by dividing the mileage by gallons of gas. When I fill up the gas tank, the travel distant until empty is 345 miles. By looking at Vash's picture, I doubt he actually gets 30mpg. If what on the screen are true then the distant until empty should be close to 400 miles but it is only 305 miles. Can you do us a favor and recalculate your actual gas mileage by dividing the mileage by gallons of gas on your next fill up?

^^^ i drove like a granny for a couple of miles on the freeway. trying to gradually increase speed, then gradually let off the gas (balance it) to keep/stay on same speed. hard to explain, but it's really f***ng boring! eh, im sorry i cant count the total mileage for a full tank, cuz' i randomly fill it up. - i dont wait till its close to empty, or even 1/8 tank.

like i said on my other post, my actual avg daily mpg (the way i regularly drive) is 19mpg/24mpg city/hwy. And no complaints, cuz im having fun

I don't trust the miles to empty at all. It actually increases at times for me, such as getting better mileage. It will also stay at the same amount for several miles sometimes.

Yes, it is approximately miles not actual miles. It is adapted to your driving style so if you get 30mpg, at the time you fill up your gas tank, it should yield mpgXgallons ~ 30mpg X 16gallons (almost empty) = 480miles.

Isn't this the 2007+ Sedan forum?
I'm not trying to be offensive so don't get excited BUT now, I see, we are even comparing gas mileage of first gen G35's to second gens.
It's not even the same car/engine...is it?

Who says you have to stop at red lights?