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Sedans Infiniti M35/M45 Infiniti M35/M45 Real World MPG
91 messages, Last post on Nov 27, 2009 at 4:41 AM
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Computer said 18.5 mpg. Calculating it myself at fill-up yielded 18.8 Combined (mostly non-commute time on this fill-up) highway and city. |
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Replying to: maximafan (Jun 24, 2006 7:01 pm) I didn't say it was easy, just that it became a personal challenge, since the easier thing to do is punch it whenever the urge hits! Drove the M to the Poconos on Sun and at 65-70 MPH continuous driving, averaged 25.6 MPG according to the computer readout. Now, if I was willing to stay in the right lane, keep my speed at 60 and be passed all the time, I'm willing to bet I could get 27 MPG - but who cares!  I've already proved to myself that it could be done - now I'll fall back to my 17-18 mpg and just enjoy driving my M! After all, it's only costing me ~$25/month!  BTW, An informal measure that I like to use in assessing a vehicle's real world efficiency is that the car's fuel tank should enable it to go 400 miles on a tank of gas. Anything less and I find my self stopping too frequently for fill-ups. The M appears to fall just below this benchmark. That's about the only real complaint I have! |
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I have a 2-month old M35x and I continue to be disappointed by the gas mileage. I am getting typically 15-17 mpg in suburban driving, and on a recent trip from Mass to northern Vermont I averaged 20.5 mpg. Believe it or not, I am trying to drive with gas mileage in mind. Prior to this car I had a BMW 540 which I drove much harder (without regard to mileage) and consistently 19-20 mgp in the same suburban driving. There are many things I like about the car, but the fact that Nissan can't build an engine that both performs and gets reasonable mileage should be an embarassment to them.
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Replying to: jdmass (Jun 26, 2006 6:04 pm) How many miles do you have on your M? My MPG efficiency has been consistently going up - I have a little over 8K miles on mine at this point. When I first picked the car up - local driving was ~16mpg. I am also keeping my tire pressures on the high side - 36 PSI when cold. Another thing I try to do whenever traffic permits is to use cruise control (non-adaptive). Here's another data point. My spouse drives a '98 BMW 328I w auto trans w 68K miles. In combined local/highway driving (60%/40%)she has been averaging ~22 MPG with no attention to fuel efficient driving technique. When I drive it, I can usually improve that MPG number by ~4-5 mpg over a few tankfuls of fuel. |
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Replying to: sfcharlie (Jun 24, 2006 4:18 pm) ...DC...Philadelphia...DC...Savannah...home. Mileage per gallon was 20.9. I may have gotten more had I stayed on the interstates, but I wandered a bit.
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Replying to: altared (Jun 24, 2006 2:06 pm) I will be getting my 2007 M35x in late July and I won't be caring one bit about gas mileage... and we pay a lot more for gas in Canada than you do in USA (just finished spending almost 5 years of my life living in USA). Although this is a gas mileage forum, for me the disappointment with the M35 series' mpg is not paying for the gas. It's that we can get cars with 350 HP at this gas mileage. In other words, I'd expect an engine/transmission in a $50K car that gives me well over 300 HP in return for 17 mpg. It's not a $$$ issue. It's a bothering-to-engineer the car up to contemporary engineering standards (e.g. what Audi is doing with their V6 and, in the fall, their V8, with FSI; or BMW did with its new engines) by giving a lot og HP per mpg -- not dropping a 1995 V6 (although a great one) into a 2006 car. |
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Just completed a round trip yesterday from Raleigh, NC to Newport News, VA with 95% of the travel on the highway. Used several methods of driving (cruise, and pedal to the metal) with decent results. For anyone that has driven that route, here is as close as I can remember to what I did. I had the cruise set on 75 m.p.h. while on US-64, used the pedal to medal on I-95 and stayed in the 80 m.p.h. ball park (due to traffic), and I had the cruise set on about 65 m.p.h. on US-58 (a known speed trap especially in and around Emporia, VA and Suffolk, VA. I calculated that my m.p.g. was around 23.7 (17.5 gals to fill back up w/415 miles) and the computer calculated the mileage at 23.4 m.p.g. (calculated on average I believe). Not sure what you guys think, but I think that is good mileage using regular fuel, with the AC working, on a light load in a vehicle that now has 11,400 miles on it. By the way, I didn't see any other M's on the highway. I did see several FX's and got plenty of gawkers at the rest stop!
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My last tank of the break-in period, I tried regular unleaded (87 octane) and got a little over 17 mpg in mixed city-hgihway driving. Just filled up with 89 octane and immediately seemed to get a jump in mpg to the 22-23 highway and 19 overall range. I'll report in after this tank is used and then next time I'll experiment with 91. |
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Replying to: rlejr66 (Jul 17, 2006 8:50 am)
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Replying to: pat (Jul 17, 2006 9:45 am)
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