Greetings. Does anyone drive an m37, or any other 3.7L powered infiniti?? I was able to nurse 27mpg from my m56 on a long road trip once, and if driven sedately I can get 18mg in the city, though with "enthusiastic" driving I usually score 16mpg. My theory is that a large car with a large engine will fare about as well in term of fuel economy, if not better, than the same car with a smaller engine. Any input???

That was always my assumption u would think that it would take the same amount of energy to move the weight... I'm currently getting 16.9 MPG on my 2011 M37 I just bought like two weeks ago that city driving though I'm planing on taking it on the open road in a couple of days n really hopping to do better

I'm pretty sure that the numbers will be identical. I wonder what gas mileage do the hybrid and the diesel models get.

I think your theory is wrong a six gets better mileage than an eight in the Infiniti .if everything was 100% efficient you would be right but I think the six waste less than the eight . disclaimer I can read the mileage stickers on cars but don't understand the details
Mazz

Part of the problem is that the M body probably only needs 20 or so HP to maintain 70 mph and the 6 and 8 can both make it easily but the 8 will always be fueling 2 more cylinders. The m37 is 9/10th of the m56 and the handling is better due to reduced weight. The 6 revs quicker and is more matched to the car than the truck motor Nissan uses in the M56. For the M56 to make sense it needs to be putting out over 500 hp.

I average around 21mpg with the M56 which is the same was what I was getting with a 2008 G35. The 90 horsepower/150ftlbs torque difference between the M37 and the M56 is a no brainer for me.

mazz wrote:I think your theory is wrong a six gets better mileage than an eight in the Infiniti .if everything was 100% efficient you would be right but I think the six waste less than the eight . disclaimer I can read the mileage stickers on cars but don't understand the details
Mazz

The mileage stickers on cars are derived from dyno testing, not real life. They discount a lot of the conditions in real driving. A sixer will burn less fuel while idling, and not while moving a 2 ton heap.

In mixed driving and some WOT, I get in the 16's. This sounds like what Maddwog is getting with his M37.

I am with dmclone on this one: the difference in power and torque is a no brainer; and the slight (if any) difference in fuel economy, I could care less about. It always makes me laugh that people buy these types of cars, and then worry about fuel economy, when there are plenty of other cars that get better MPG for far less money.

I'm at 18.4 with the M37x in normal mode in typical suburban/short freeway driving.

Yeah 18 mpg range for me as well but I'm mostly city with some highway. Pure highway gets me 27-28 at best. I stay in sport mode all the time. I was hoping to do a bit better coming from an FX45 with the V8 but not so much.
I think they should get a proper sports car V8 or just scrap it and have a super charged or turbo option on the V6 as an upgrade, kinda like the Jags. Or go crazy and do both V8 and super charger. Also needs a true sport mode which can defeat all driver aids like the Audis.

gwoods wrote:Part of the problem is that the M body probably only needs 20 or so HP to maintain 70 mph and the 6 and 8 can both make it easily but the 8 will always be fueling 2 more cylinders. The m37 is 9/10th of the m56 and the handling is better due to reduced weight. The 6 revs quicker and is more matched to the car than the truck motor Nissan uses in the M56. For the M56 to make sense it needs to be putting out over 500 hp.

The m56 still has more power than a Saudi king, and according to some of the reports on these threads, the MPG numbers re pretty much identical.

russianbear54 wrote:

mazz wrote:I think your theory is wrong a six gets better mileage than an eight in the Infiniti .if everything was 100% efficient you would be right but I think the six waste less than the eight . disclaimer I can read the mileage stickers on cars but don't understand the details
Mazz

The mileage stickers on cars are derived from dyno testing, not real life. They discount a lot of the conditions in real driving. A sixer will burn less fuel while idling, and not while moving a 2 ton heap.

The six burns less fuel idling or moving, it just does period. Now which motor is best for you is just your decision I did not buy the m37 to save money on gas if I needed or wanted 50 more horsepower I would have bought the v8 I am 60 years old and 320 or 340 is quite enough . But I do appreciate your comments

[quote="Maddwog"]That was always my assumption u would think that it would take the same amount of energy to move the weight.. I'm currently getting 16.9 MPG in the city on my 2011 M37 I just bought like two weeks ago, but I'm taking it on the open road in a couple of days n really hoping to do better..

Update: shortly after writing this I went to AutoZone and bought this "Lucas Oil/16 oz. Deep Clean fuel system cleaner" did two treatment roughly a 1000miles between and now I'm getting 18.3mpg...

Ummm ... just don't add any Lucas oil additives to your engine oil though. See http://www.bobistheoilguy.com (if that old page on the Lucas oil additive is still there) for info as to why ...

EDIT: The old test is gone. Here is what it used to be: http://web.archive.org/web/201009261333 ... /lucas.htm ... unfortunately, the pictures are missing.

Anyway, if you want to clean the injectors, use BG-44K (I buy from eBay sources). This gasoline additive will do a good job of removing deposits and keeping injectors clean. Use one can, drive for about 600 miles and see if you think you need another session ... but don't do more than 2 in any given 3k mile interval. In the 157k miles, I have on my M45, I think I am at 7 maybe 8 sessions of BG-44K.

Z

I actually considered trading in my M37 for an M56. But after paying 60 bucks at the pump the other day, I was like "ummm....nah". But now people are saying it's all the same?

The MPG ratings between the 37 or the 56 is not drastic enough imo to make the difference. I get about 19.5 combined (per the dash indicator). You will get slightly less MPGs from the 56 but it definitely won't break the bank. The upfront cost of the car will probably hurt your wallet more than going to the gas station. You can find good deals on 56s if you look hard enough.

Yeah I dont think there is much difference in gas mileage between the 2. I'm getting 18- 20mpg in mixed driving. I hoped for better but i'm not too concerned with it. I'm coming from 6.0 v8 engine that got 15mpg highway.

maybe I should try ECO mode more

coolchuck wrote:Yeah I dont think there is much difference in gas mileage between the 2. I'm getting 18- 20mpg in mixed driving. I hoped for better but i'm not too concerned with it. I'm coming from 6.0 v8 engine that got 15mpg highway.

maybe I should try ECO mode more

Eh...ECO mode definitely is a killjoy. You have a 330 HP motor or a 420 HP motor. If you were concerned about MPG, you should not have gotten this car in the first place! A good compromise would have been the M35h, but I've read the transition between the electric and gas motors is kind of disruptive.

If you owned an 2011 M37, would you trade it in for an M56? Would it be worth it? The upfront costs won't bother me, I'm just wondering if it's really worth it. Has anyone driven both and could give me advice? Is is really that much quicker? I've heard people say the M56 is a bit rougher ride.

The m56 is definitely a smoother engine and has a ton of torque off the line. The one I drove was not well cared for though so I didn't push it around the corners. Based off of reading articles, it seems that most people are content with the power and performance of the V6. The V8 is about a half second faster from 0-60.

I have also read that the V8 does not handle as well as the V6 due to the increase weight in the front (and the uneven weight distribution because of this). I personally wouldn't trade-in for the V8 unless you absolutely have to have one.

I read a review somewhere that nailed the difference between the M37 and M56 very well. It basically stated that if you like brute force and thrust, get the M56. If carving up canyon roads is your thing, get the M37.

I'll go test drive one and see what I think. I just love having a V8 under the hood (my last car had a V8).

mrjenkins44 wrote:I'll go test drive one and see what I think. I just love having a V8 under the hood (my last car had a V8).

V8s are wonderful. I have a 94 BMW 530i (little V8 compared to the 540i). It's only got just over 200 hp but it is smooth as butter and never feels like it is straining. That thing take 7.5 QTs of oil though (it's only a 3.0L) so oil changes are expensive. MPG is a whopping 17 mpg combined (a wrenching 15 mpg in the city).

It's our 3rd vehicle though so it doesn't get out much.

SwissCheeseHead wrote:

coolchuck wrote:Yeah I dont think there is much difference in gas mileage between the 2. I'm getting 18- 20mpg in mixed driving. I hoped for better but i'm not too concerned with it. I'm coming from 6.0 v8 engine that got 15mpg highway.

maybe I should try ECO mode more

Eh...ECO mode definitely is a killjoy. You have a 330 HP motor or a 420 HP motor. If you were concerned about MPG, you should not have gotten this car in the first place! A good compromise would have been the M35h, but I've read the transition between the electric and gas motors is kind of disruptive.

I' m not worried about MPG at all with this car. I've got a Nissan Sentra to get my 34MPG drives on.

I drive 11 M56X for over 2 years now. Getting average 20 MPG without trying to save fuel. I tried using the Eco mode few times and managed up to 29 MPG steady on a flat section of the highway, but it is not realistic do drive like that for a long time. However on a 800 miles trip from NC to NH I averaged 26 mpg for the whole trip without any effort to drive economically. I don't think M37 would do much if any better.For me this gas mileage is quite satisfying.Especially having in mind my Subaru Forester XT averages 20 mpg as well and it's much smaller and slower car.To have a good gas mileage at 70+ miles/hour you really have to get a diesel. Any gasoline engine will need a lot of gas if you mash that gas pedal :-)

I've driven the M37 as a loaner few times and also the G37s many times and I can not even imagine someone will consider M37 or G37 over M56 if the money are not a subject. Hands down. No room for comparison when it comes to dynamic and fun to drive. M56 has so much torque at lower Rpm's just like a diesel. It makes 4.8 seconds 0-60 . No wonder they are so popular at places with great concentration of wealth like Abu Dhabi,Dubai etc... those shiekhs love them.Just watch the Mall of Dubai car fleet videos on You Tube. Even the G37 being much lighter feels so much more slower ...In my eyes the M56 is a bargain for the power/reliability/price combination .Especially used now prices of M37 and M56 are very close. I've drag raced few times with new Dodge challengers and chargers and won. Don't think M37 or G37 can do that . 1-2 mpg difference is a very subjective thing since different people drive different.

Or you could drop in a GTM supercharger and make 600HP in an M37 with minimal weight increase. Blow the pants off an M56.

http://www.gtmotorsports.com/product.ph ... ctid=17703
DYNO GRAPH: http://www.gtmotorsports.com/images/pro ... 7_DYNO.JPG

I personally use Seafoam every other thank or every third tank. I also put a 'shot' of it in my oil every oil change. My M35 ran from 32kmi to 138kmi before I traded it in without a single oil burning issue or any other engine problem. Engine still ran perfectly.

JBHorne wrote:Or you could drop in a GTM supercharger and make 600HP in an M37 with minimal weight increase. Blow the pants off an M56.

http://www.gtmotorsports.com/product.ph ... ctid=17703
DYNO GRAPH: http://www.gtmotorsports.com/images/pro ... 7_DYNO.JPG

I am consideering this option

How badly does that Supercharger void my Warranty?