i just used seafoam for my oil, vacuum line, and fuel tank...runs like new. i'm averaging about 19-21 doing daily commute @ 85ish mph. i've never seen mpg that low unless you're running different a higher ratio final drive..

 

Try 335d and you will be surprised, just as fast as g37(actually faster) and you can easily get 45-50mpg on the highway and 30mpg on average. Too bad Bmw no longer brings that 3 liter turbo diesel to the states.

Also 335i, mustang v6/eco get 30+ on highway easily (in fact 35-40mpg is quite common) if you know how to hypermil. I don't know which lincoln you are talking about but as far as I know they are heavy, not aerodynamic and some of the mare awd so that comparison is irrelevant. Also turbo direct injection engines are efficient as long as you use them out of boost and gently, if you push they will consume a lot. The problem is with the current g37 no matter how gently u use you will still get crappy mpg in city like a v8 and that sucks.

For the last 1-2 years there are lots of vehicles with the same power output and considerably better mpg.

Still I like my G37 coupe a lot...

 

could u name some? i'm genuinely curious. i would love a vehicle like this but with better mileage

 

So, comparing similar cars, the 335i xdrive is a mere 20k more, slightly smaller and lighter and gets 3mpg better, until you turn off the horrendous auto stop start system.

Can't defy the laws of physics.

 

20K ? I have no idea where you are getting that number but if you search the web you will see that it is more like 5-8K difference depending on the options.


Btw as used I think G37x coupe is an amazing value I am just pointing out something else.

 

New Wrx (the 2015+ model), mustang ecoboost. Corvette (450+ hp and it still gets 38mpg on the highway), the 2016 camaros (2 ltr turbo will obviously get better mpg while v6 will have cylinder deactivation so it will also be significantly better than g37).

In short the 2liter turbos outputting 270-300 hp with direct injection and the direct injection V6 (especially with the new fuel management) will get better mpg when you go easy on them.

However I like the q50 hybrid and I think infiniti should just switch to direct injection and continue the hybrids.

 

With BMWs a la carte options pricing, you can have a $45k car become a $60k car awfully fast.

 

Same with Infiniti, or pretty much any manufacturer. All options checked you can turn a Q50 into a 57k car. It starts at 37k.