Very poor gas mileage on 2010 Odyssey compared to 2001

[stanlam]

Does anybody know why a 2010 odyssey EX-L would get worst gas mileage then a 2001 odyssey?

On the 2010 we normally get about 250 miles before a fill up.

On the 2001 we normally get about 350 miles before a fill up.

Both of these vans have the same size gas tank and we do the exact same type of driving on both vans. We asked the person at the dealer and they didn't think anything was wrong.

Somebody asked me if the ECO light turns on on the 2010, and yes it does.

[Steve P]

You need to post what your actual miles per gallon is, since saying "about x miles before a fill up" doesn't really mean much.

I owned a 2001 before we got a 2010. My actual MPG is about 1 MPG less with the 2010 than the 2001, so I'm seeing a slight decrease.

[wild willy]

Hey..I get 150 miles Max on my 2004 before light comes on...Be Happy

[Snobike Mike]

Your 2010 is probably a big heavier and your engine has a bit more power, both of which will affect your fuel mileage.

I'd run a few tanks and track actual miles and gallons put in to confirm your conclusion.

Cheers.

[davedrivesody]

Brand and age of the tires can affect fuel economy.

[wild willy]

Brand and age of the tires can affect fuel economy.

Age? The older and harder the better..No?

[Dirkdaddy]

Just filled up today, mixed driving mostly to school and back which is short, a lot of town, a bit of highway 30%?, my calc'd mpg was 18.5 and I was mad I didn't get 20. I have a pretty light foot most of the time but that tank did have two wide open merges. Not too bad, but I'd like to keep it above 20, which maybe wishful thinking.

[wild willy]

I got to fill today.......Will post results later.

[DrD]

A 30% drop seems like a lot - maybe it's driving habits? The newer Odyssey probably feels more composed, etc. so it's easier to be going faster than you think... The 2010 isn't that much heavier than the 01 (225 lbs or so) and has a bit stronger engine (240ft-lbs/244hp vs. 229/210) and they are around the same height/width, so I don't know if size/engine plays too much of a role (they are also both rated at 16/23 for mpg)

tires and tire pressure can have a big impact (as well as fuel quality) but I don't think that would explain a 30% drop...

[kenny1773]

I filled up today and calc'ed the MPG at 17.9

That is in the high side for me for all in town driving short trips (short being 3 miles or less)

The weather here has warmed up a bit (the 12mpg was with 20F mornings, now closer to 40F) so I am sure that is good for part of it.

However, if you see my other thread about ODB2 communication issues, you will know that I just changed out the 2 wideband O2 sensors (bank 1 sensor 1, bank 2 sensor 1) and this is my first tank running 100% on the new O2 sensors.

I also recently put in mobil 1 EP 5W-20 oil (what I had in there before was the Napa Synthetic, which is made by valvoline 5W-20) I am sure the EP is 'better' oil, but not sure if that helped the MPG much.

It makes me wonder what really caused the mileage change (as always, it's a little bit of everything).

[wild willy]

165 Miles/ 17.5 gallons = 9.42mpg

Premium Fuel

[stanlam]

165 Miles/ 17.5 gallons = 9.42mpg

Premium Fuel

There has to be something wrong with your car.

[stanlam]

A 30% drop seems like a lot - maybe it's driving habits? The newer Odyssey probably feels more composed, etc. so it's easier to be going faster than you think... The 2010 isn't that much heavier than the 01 (225 lbs or so) and has a bit stronger engine (240ft-lbs/244hp vs. 229/210) and they are around the same height/width, so I don't know if size/engine plays too much of a role (they are also both rated at 16/23 for mpg)

tires and tire pressure can have a big impact (as well as fuel quality) but I don't think that would explain a 30% drop...

I figured these cars are almost the same in weight. I still don't know what is causing the poor gas mileage.

[wild willy]

There has to be something wrong with your car.

Been that way since Day 1

[stanlam]

Been that way since Day 1

My car has been the same way since day 1 also. That's why I'm trying to figure out how to fix the problem.