I am VERY unhappy with the 15mpg lifetime average I have recorded after 36,000 miles with my 2008 G35x .
I am considering moving to a 2009+ G37x sedan.

Can owners post real world numbers on the gas mileage they are recording?

Thank you.

 

It's been four years.
It be nice to hear results from someone.

Maybe the mods can move this to the 2009+ sedan forum ????

 

From people I've talked to at dealerships you can expect a solid 2mpg gain in the real world. 15mpg is a little low do you run premium or regular? I get 17 all city driving on premium.
Really any non-hybrid 6 cyl car that's making over 300hp isn't going to get stellar gas mileage the v6 engine losses efficiency. At 250-270hp those cars can still get pretty good gas mileage 30+ highway and have respectable power.

 

If your only purpose for switching would be fuel economy, that's going to be a bad investment. Would take many years to make up the money if ever.

I'm wondering if anyone has tried swapping the rear gear. Might be worthwhile if you drive on the highway a lot. So long as you don't might being slower.

 

15mpg?? Good god man what do you do, floor it then break as hard as you can? I get 17mpg when driving undisciplined around the city.

 

I am getting 15mpg, but that was my doing for adding a supercharger on the car. I don't have an X but still a 2008.

 

If you're seriously worried about gas mileage and the cost, you should be driving a Prius not a G!
Gary

 

Switching to a different car for 2 extra mpg would be the biggest waste if money ever. To put the expense into perspective I'd like to give you an example:

A few years ago when premium went to about $5.50/gal I bought a hybrid as a commuter car. A used 2001 Honda Insight that got 60mpg. It was awesome. I played $4900 for the car which is fairly cheap for those cars, and I started enjoying the savings. I drive a minimum of 60 miles a day round trip (for work), so I started doing the math to see how long it would take to pay for itself in savings.

Now, I get about 23.5 mpg in the G vs. 60 in the Insight; a difference of 36.5 mpg. That is a stellar difference if you ask me, but still between the low price of the car, the outstanding difference in gas mileage AND the fact that I could use regular instead of premium I figured out that it would still take me over 2 years for the car to pay for itself. So, just something to think about before you spend tens of thousands extra for a mere 2mpg. It would never make a noticeable difference in your pocket book.

 

Great logic . Now if you were getting a hybrid and driving 50k miles, that would make a difference.