31 highway winter or summer? snow tires/chains? Based on this mileage
it looks like your car is in good shape and running well.
I have a 2005 Accord v6. I tend to get an average of about 24-27
in mixed city/highway driving (probably more highway miles). I have
the nav unit and it has a page that shows the instantaneous mpg.
On a level highway at constant speed I often see 35-45 mpg at 60-75
mph. In the city I see 0 when stopped; to 10-15 when accelerating.
I'm fairly gentle on the pedal and try to coast (at least not
accelerate) when approaching red lights.
15 seems a bit low for city but it could be reasonable depending
on rolling resistance (snow / slush) and how aggressively you
accelerate. They designed the engine to accelerate the car fairly
aggressively if one steps firmly on the pedal. Of course the
engine consumes lots of gas to do this.
You could try taking a test drive in a nav equipped accord and look
at the instantaneous mpg page.
The winter problem is even more of an issue with cars that get much better
economy normally. My wife's car is a '02 Prius (hybrid) and she gets 50 mpg
around town in three seasons and low/mid forties in the winter. It has a
real-time mpg display, and I decided to see what would happen if we turned
the heater up full and opened the windows in town one winter day. I was
amazed to see the 5 minute average drop to 25 mpg! I guess the heat has to
come from burning fuel one way or another.
I would be very surprised if the engine comsumed more or less fuel
based on the amount of heat being directed to the passenger compartment.
There is so much excess heat being produced all the time.
Has anyone else noticed this?
The only way I can imagine an increase in fuel comsumption due to
heating the cabin is if the engine got so cold it went into "enrichen
the mixture" (equiv to choke) mode. In that case you would feel very
little heat from the vents because the engine was so cold.
(wild speculation) It also could be possible that fan motor used more
power, but 5 mpg?
I don't actually know, but I'm not sure that is true any more. (It isn't for
the Toyota hybrid system, which restarts the engine based on system
temperatures.) I suspect engine downsizing and increases in efficiency have
meant less waste heat. Cold mpg has always been the pits, even in the old
days, and maybe excessive heater use cools the engine enough to impact fuel
economy. That's pure speculation on my part, though.
I have a 2004 accord V6 that I have had for nine months and I track the gas
with a computer program and I average 26.5 MPG since I bought it new last
I use 87 octane and most of my driving is around town.
There are many reasons for such a low milage. Some thing to check
are: If your buying your gas at the same place all the time maybe the gas pump
computer is wrong :it reads 12 gallons but only pumps 10. Someone has a siphon
hose stealing gas from your tank. I owned a 2000 accord V6 before the 2004
and averaged about 24 MPH
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