We are at about 2700 miles. I'm still getting between 19-20..my commute is a 12 mile drive on country roads (55 mph speed limit) with about 5 stop signs. Our mpg dropped to around 14 when doing city driving this weekend. I'm using mostly 90 octane ethanol free.
I just refilled for the 1st time. My first tank was 93 octane, and I averaged 16.5 mpg. I think that's pretty low. Refill was half 87 and half 93 octane. I'm going to record all of my fillups for the first 3 months or so...trying different octane levels, etc.
2nd tank was half 93 and half 89 octane. Averaged out to 17.9mpg of mixed driving. Trip calculator on the nav said 18.4mpg, but it was wrong. I've found that those things usually are. Went 320 miles on 17.8g.
Filled up with 89 octane this time. Interesting to see the numbers at next fillup. Driving is the same week to week.
MPGs are related to the avg MPH you are driving. a % of city vs hwy driving means nothing. city driving can be defined in a multitude of ways depending on where you live and how the car is being driven. some people's city is in stop and go traffic of metro areas, other people's city is in moving conditions cruising around a non-urban roadways which are not riddled with heavy volume.
with that said:
09 with tech, 93 octane
17 MPG at avg speed of 25 MPH (this is my typical).
i've had as high as 24 MPG at avg speed of 67mph (300 mile road trip with hitch rack and bikes hanging off the back end and cargo in the back). this is with the AC on.
for those with under the EPA 15mpg, you are most likely sitting in bumper to bumper traffic and stop/go stoplights at every block.
I have an 09' Tech Package, fist things first, the difference between the my mdx and some of you with the newer ones is that my 09' has a 5 speed tans, vs. the 6 speed so that's one factor. I put 87 octane in my x now, in return I get around 17.5 mpg in the city on average. I have tried putting premium in it before and didn't see any difference in performance or in fuel economy. Now as far as engine health, I have done ALOT of research and with these newer cars, the CPU corrects for the knock that you would have in older cars because of the octane rating. If you are putting premium gas in your MDX you are wasting your money. For those of you who are mixing tanks (87/93:91 Exxon/BP) you are an idiot that is wasting your time. I can assure you that my X will last up to 300,000 miles because I don't drive it super hard and change the oil every 5,000 miles.
Calling someone an idiot for putting premium fuel into a luxury SUV for which you paid a premium is a little out of line. If you want to put regular in your MDX, no one is stopping you and I'm pretty sure that no one will call you an idiot for it. Now, I will choose to put premium in my wife's MDX because we bought it knowing it will require so. Acura put in a 3.7L engine with 11.0:1 compression which is considered high compression.
On our way back from Florida to Michigan, we averaged between high 19's to mid 23MPG. This is actual calculated MPG. The trip computer is actually pretty optimistic in this regard. When we averaged 25 according to the computer, real world results were 23.5. 25 indicated (23.5 actual) consisted of steady 70-75MPH cruise
Here's the result of about 50 miles of back country roads averaging roughly 55MPH with a few stops for lights and stop signs.
Calling someone an idiot for putting premium fuel into a luxury SUV for which you paid a premium is a little out of line. If you want to put regular in your MDX, no one is stopping you and I'm pretty sure that no one will call you an idiot for it. Now, I will choose to put premium in my wife's MDX because we bought it knowing it will require so. Acura put in a 3.7L engine with 11.0:1 compression which is considered high compression.
On our way back from Florida to Michigan, we averaged between high 19's to mid 23MPG. This is actual calculated MPG. The trip computer is actually pretty optimistic in this regard. When we averaged 25 according to the computer, real world results were 23.5. 25 indicated (23.5 actual) consisted of steady 70-75MPH cruise
Here's the result of about 50 miles of back country roads averaging roughly 55MPH with a few stops for lights and stop signs.
Put it simply, you don't put 91 Octane on a car tuned for 100 Octane, as you shouldn't put 87 on a car that Acura has tuned for at least 91 Octane. Its nothing that has to do with MPG either. :headshake
"I currently have a customer in with a 2008 MDX who has been using regular and I mean JUNK regular, and has burnt a valve. Please people, The engine was designed to run on Premium unleaded. It matters! If you dont want to put the correct gas in the vehicle, be prepared for the potential consequences."
2nd tank was half 93 and half 89 octane. Averaged out to 17.9mpg of mixed driving. Trip calculator on the nav said 18.4mpg, but it was wrong. I've found that those things usually are. Went 320 miles on 17.8g.
Filled up with 89 octane this time. Interesting to see the numbers at next fillup. Driving is the same week to week.
Had a little less highway driving this tank. Also ran 89 octane. Filled up last night, and the average of the last tank was 15.5mpg. The Nav Trip Computer said 16.7 I think, but I've found it to be wrong on every tank. It seems hung up on 16.9, 18,2, 18.9 and 19.1. I'm not sure I've seen any other numbers on the display.
But anyhow, since this last tank was only 89 octane, AND I had hardly any highway miles on it, my guess is inconclusive as to the cause of the 15.5mpg. But that number is too low.
2003 Touring - 15 - 17/mpg City, 22/mpg hwy - Approx. 58,000 miles, and I used to get 24/mpg hwy on a regular basis, but not for a few years now. I always use premium fuel, and my driving style is the same as it was when I bought the car new. The Acura dealer that services my car can't tell me why I have lost 2 mpg. Looking at some of these other posts, though, I don't feel quite so bad.
I took the wife's car to the dealer yesterday to pick up the running boards...I was in quite a shock when I learned that in mostly city driving the car was averaging 15.7MPG :O
City: 14.5-16 MPG in Canadian winter and upto 19MPG in summer mostly using Costco 91 octane gas. I have noticed though that ESSO and Shell gas gives better mielage. Have not driven on highway since I started keeping mileage log.
2003 Touring - 15 - 17/mpg City, 22/mpg hwy - Approx. 58,000 miles, and I used to get 24/mpg hwy on a regular basis, but not for a few years now. I always use premium fuel, and my driving style is the same as it was when I bought the car new. The Acura dealer that services my car can't tell me why I have lost 2 mpg. Looking at some of these other posts, though, I don't feel quite so bad.
There are a 100 + variables that effect gasoline energy levels.
Ethanol and oxygen are ones that change without general public knowledge.
Most think E10 is 10 % Ethanol cause the sticker says so. Guess again ..
Water content of Gasoline changes due to exposure, time, and weather.
Ethanol attracts Water like a sponge and causes engine corrosion.
Almost all are ignorant of what % oxygen is in their fuel. It changes often ..
Few even realize their are Winter and Summer Blends.
These and many other mix formulas change not only in brands and grades but also in area you live in.
It also changes over time and from batch to batch.
Add variation of weather and city driving conditions like Grass Valley to NYC, and lead foot to light foot, your passengers weight luggage and ...
That's MPG.
There are a 100 + variables that effect gasoline energy levels.
Ethanol and oxygen are ones that change without general public knowledge.
Most think E10 is 10 % Ethanol cause the sticker says so. Guess again ..
Water content of Gasoline changes due to exposure, time, and weather.
Ethanol attracts Water like a sponge and causes engine corrosion.
Almost all are ignorant of what % oxygen is in their fuel. It changes often ..
Few even realize their are Winter and Summer Blends.
These and many other mix formulas change not only in brands and grades but also in area you live in.
It also changes over time and from batch to batch.
Add variation of weather and city driving conditions like Grass Valley to NYC, and lead foot to light foot, your passengers weight luggage and ...
That's MPG.
What you say is true. I was responding to someone who said his mileage dropped three years ago, without any change in driving habits. He didn't mention that it changed seasonally. So, either something changed in his car, or in the fuel. Ethanol is known to be an mpg killer.
Thread is pretty dead...but thought I'd update. Now at 5,500 miles and overall life average is sitting around 19mpg according to MID. Did a 450 mile trip a week or so back and managed 22.7mpg on a single fill. MID was reporting 21.4mpg for that tank so it seems to be conservative. Pretty happy overall...only expected to average around 17mpg overall. Running 93 octane BP most of the time but sometimes will use 89 if tank is half-full.
Just wanted to note on my trip to LA, the average actually got up to 25mpg while doing 80mph most of the way. I was pleasantly surprised. My typical average around town and normal highways is usually around 19-20.
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