2012 5 fuel economy reports

Best I've done so far is 30.1 and thats with using an ultraguage to watch the realtime readout. That was on a paddling day driving mainly mountain roads with a kayak and paddle on top. The wife has been getting 24-26 in mixed driving.
 
At almost 2500 miles, I am seeing 24-27 in mixed driving. I have yet to make an all highway trip.
 
Time for Mazda to offer more choice of engines like Skyactiv and Diesel offering in the states. I'm sure it's would not be unheard of to get 40+ MPG on gasoline for MZ5.
At almost 2500 miles, I am seeing 24-27 in mixed driving. I have yet to make an all highway trip.
 
We recently went on a nearly cross country trip. Was at ~11xx miles when we left.

Wife was getting 23mpg 100% city.

I averaged 27 total for the trip, but really every fill up was either 23mpg or 29ish mpg. There really wasn't anything in between. I averaged 72mph for the trip there. Max speed was 107 :) In Wyoming.
Obviously pretty loaded down, 2 kids and 2 adults, and a week's worth of stuff.

Now that we're back, she's averaging 24.5 mpg all city. 7800 miles on the ODO now.

This was CA to WI, stopping at Mt Rushmore, and then back, but we took 80 all the way back due to time.
 
Last edited:
If you use Premium (93 octane), you will get better mileage. There's a MazdaForum.com member Shippo that vehemently oppose to this concept, however, I've owned more than 20 different cars since I've been driving since 1985 and never had engine issue(s) as a result. I would say you will get instant 1 to 2 mpg improvement over regular unleaded.
You guys getting 30mpg are the ones I don't want to be behind at lights.
 
If you use Premium (93 octane), you will get better mileage. There's a MazdaForum.com member Shippo that vehemently oppose to this concept, however, I've owned more than 20 different cars since I've been driving since 1985 and never had engine issue(s) as a result. I would say you will get instant 1 to 2 mpg improvement over regular unleaded.

That's not true, though. In fact, you'll could see worse fuel economy because it won't burn as efficiently due to being more difficult to ignite than lower octane fuel. Unless the engine is tuned to take advantage of higher octane fuel, you won't see any improvement in its running. You might as well buy some snake oil.

http://www.scientificamerican.com/article.cfm?id=fact-or-fiction-premium-g
 
Even when I had an 87 MR2 I only ever have used 87 Octane. There is zero difference except is one thing: the price at the pump. For "1 or 2MPG instant difference" I'm not going to pay 0.10 to 0.15 cents more per litre. I've never had engine issues on any vehical and blamed the gas for it.
 
I like giving my MZ5 a full tank of Shell Premium every once in a while. For my new Speed3, I give it Plus but filled up with full tank of Shell Premium the other day. For this car, I saw an instant increase of about 2MPG and engine shakes less, maybe the knock sensor is working less? Who knows. Anyway, not trying to convince anyone of anything here. Whichever makes sense for you that's the right answer. There's no right or wrong answer, just stating my experience.
Even when I had an 87 MR2 I only ever have used 87 Octane. There is zero difference except is one thing: the price at the pump. For "1 or 2MPG instant difference" I'm not going to pay 0.10 to 0.15 cents more per litre. I've never had engine issues on any vehical and blamed the gas for it.
 
I like giving my MZ5 a full tank of Shell Premium every once in a while. For my new Speed3, I give it Plus but filled up with full tank of Shell Premium the other day. For this car, I saw an instant increase of about 2MPG and engine shakes less, maybe the knock sensor is working less? Who knows. Anyway, not trying to convince anyone of anything here. Whichever makes sense for you that's the right answer. There's no right or wrong answer, just stating my experience.

For the Speed3, a I didn't know you were referring to that car (oops) ...and you are right, use what works for you.
 
No biggie, I love both cars either way. Hopefully, in the next few years, if Mazda continue to offer Mazda5 here in the U.S., we'd be talking about high 30's for MPG on the highway, not upper 20's. I have a feeling that a lot of the part or maybe the whole engine is a leftover from the Mazda-Ford days (you can see this when you remove the engine cover). I'm not saying that's the reason why engine is not that fuel efficient but maybe it's not totally a Mazda engine. I just can't see Mazda can sell the 5 in Japan markets with the 2.5L engine as the fuel prices over there is more than double, let alone rest of the world.
For the Speed3, a I didn't know you were referring to that car (oops) ...and you are right, use what works for you.
 
I like giving my MZ5 a full tank of Shell Premium every once in a while. For my new Speed3, I give it Plus but filled up with full tank of Shell Premium the other day. For this car, I saw an instant increase of about 2MPG and engine shakes less, maybe the knock sensor is working less? Who knows. Anyway, not trying to convince anyone of anything here. Whichever makes sense for you that's the right answer. There's no right or wrong answer, just stating my experience.

That's because Mazda says the Speed3 requires 91 octane. Filling it with 89 is going to do it damage, hence why it's running rough when you do so.

No biggie, I love both cars either way. Hopefully, in the next few years, if Mazda continue to offer Mazda5 here in the U.S., we'd be talking about high 30's for MPG on the highway, not upper 20's. I have a feeling that a lot of the part or maybe the whole engine is a leftover from the Mazda-Ford days (you can see this when you remove the engine cover). I'm not saying that's the reason why engine is not that fuel efficient but maybe it's not totally a Mazda engine. I just can't see Mazda can sell the 5 in Japan markets with the 2.5L engine as the fuel prices over there is more than double, let alone rest of the world.

It is indeed a Ford relic; it's a Duratec engine with slight Mazda modifications done to it. The MZR25 is a placeholder until the new Sky-2.5G comes online in full. It'll go into the 2014 Mazda6 first, followed most likely by the CX-5, then the Mazda3 (I presume as the range-topping non-Speed engine), then if we still have the Mazda5 in North America, it'll go there last. Most markets with the Mazda5 don't see the MZR2.5 at all.
 
Okay, I'm happy... first fill-up to track mileage, drove 435 miles, combined highway/local (not city, country with low speed limits 30-45, and lights) 30.5 MPG!!!

2012 Touring
 
It is indeed a Ford relic; it's a Duratec engine with slight Mazda modifications done to it. The MZR25 is a placeholder until the new Sky-2.5G comes online in full. It'll go into the 2014 Mazda6 first, followed most likely by the CX-5, then the Mazda3 (I presume as the range-topping non-Speed engine), then if we still have the Mazda5 in North America, it'll go there last. Most markets with the Mazda5 don't see the MZR2.5 at all.

I like this relic ;) it's got pep and the fuel economy is very satisfying compared to my previous vehical ...My 03 MPV had a 3.0L V6 Duratec that was Mazda modded and gave me zero issues in almost ten years. Here is to hoping the 2.5L 4cyl. is the same 8)
 
It was Ford who commissioned Mazda to design the whole line of MZR/Duratec I-4 engines in the early 2000's. The MZR is a Mazda design that was engineered to go 275,000 without any major problems. They are very dependable engines and Mazda engineered them well. So well, that Ford is the only car manufacturer that is still using them in new eco-boost models, and has no intentions of getting rid of them anytime soon. The transmissions that Mazda uses for the 5 has a lot to do with gas mileage too. The transmission is the other half of the mpg equation. 28-30 mpg's highway for the 5 isn't bad for a vehicle that has a curb weight of 3,457 lbs. A co-worker of mine has a 2008 Cobalt that only gets 28-31 mpg's on the highway, and that is a compact car. I have been pleased with the mpg's of my 2010 5, it isn't the best of them all, but it is competitive.
 
It's all good, not a huge fan of Ford though. My first Ford was a 1988 Mustang GT 5Speed, then the 1990 Ford Escort LX. Had a horrible experience with that car with bad tires/suspension when bought new then the driver's side window falling off its track. Then had an opportunity to work at a car rental company that had only carried Ford/Lincoln/Mercury products. Vehicle that had the most problems were the Mazda/Ford joint venture products. On the other hand, the Nissan/Ford product called the Mercury Villlager was excellent; primarily due to the product was just a re-badged Nissan Quest. One of the worst Ford product we rented was the Ford Aerostar minivan. It was a terrible minivan and on one occassion, it flipped over. Haven't purchased a Ford vehicle since then.
It was Ford who commissioned Mazda to design the whole line of MZR/Duratec I-4 engines in the early 2000's. The MZR is a Mazda design that was engineered to go 275,000 without any major problems. They are very dependable engines and Mazda engineered them well. So well, that Ford is the only car manufacturer that is still using them in new eco-boost models, and has no intentions of getting rid of them anytime soon. The transmissions that Mazda uses for the 5 has a lot to do with gas mileage too. The transmission is the other half of the mpg equation. 28-30 mpg's highway for the 5 isn't bad for a vehicle that has a curb weight of 3,457 lbs. A co-worker of mine has a 2008 Cobalt that only gets 28-31 mpg's on the highway, and that is a compact car. I have been pleased with the mpg's of my 2010 5, it isn't the best of them all, but it is competitive.
 
I am not defending Ford by any means, in the past their cars especially had poor reliability, my whole point to that was that the MZR's inline 4's aren't Ford designs at all, and neither did Ford really have a joint venture in the making of it. They basically let Mazda's engineers design the engines and then since about 2002-2003 has used them in their cars. Ford had little to no effort in the engineering of these motors. The reliability of the MZR's motors over the last decade are really good.
 

New Threads

Back