Whoa, that is some pretty bad mileage for a 4 banger. My 1993 Probe SE 2.0
with 139k miles and an automatic regularly got 31 mpg on the highway and
less in the city. You should be doing a lot better with the focus.
No. You should be getting at least in the high 20s. Things to check: air
filter, sensors, thermostat (does it have heat?), a bad spark plug or wire,
dragging brakes (are they hot when you finish driving?)
I bought an '05 Focus ZX3 about 3 weeks ago: PZEV four-banger, auto tranny,
28000-ish miles. In my first 3 fill-ups my calculated total average fuel
economy is 26.70 MPG in mixed use driving. I've built a spreadsheet to track
my total cost of ownership - I'll probably post updates from time to time...
FWIW, I just retired a 1993 Escort wagon, 1.9l, 5 speed, 135000-ish miles.
The fuel gauge didn't work, so every 300 miles I would fill-up the tank and
reset the trip odometer. That car almost always used 10 gallons of 87 octane
to go 300 miles in mixed driving. It was just consistent at 30 MPG...
My wife said I was probably the only one that used a spreadsheet to track my
'01 ZX3's mileage. Now I can show her this!
For 95,000 miles, I am at 30.94 mpg overall. That's with about 45% two lane
and 55% limited access roads.
Hey cool! I'm not the only numbers nerd around here!!!
In addition to the MPG tracking, I'm tracking every dime I spend on this
car and every mile I drive. That should give me a pretty good idea of my
total cost of ownership of this car. I'm tracking insurance, registration
and I'm even tracking the $5 "saltbuster" carwash I got yesterday... This is
something I should've done beginning with a few cars before this one, but
going forward I'll be able to use this Focus as a baseline to compare other
Oh, by the way, I was mistaken in my previous post - the car is a ZX4...
I have a 04 ZX5 2.3 with auto, normally get 28-29 on trips where the
speed limit is 70-75 and about 24 around town (suburbs). My 99 Escort
used to get 37 and 30 in the same type use, but that was a 2.0 and stick
mad dog wrote:
What sort of winter - summer differences in gas milage do you Focus owners
get (assuming that you have cold winters)? I get about 28 mpg in the summer
and 25 mpg in the winter (suburban commuting and running chores) in Buffalo,
While it is true that some over inflation of the tires can reduce rolling
resistance and thus improve fuel economy, there are some drawbacks to doing
that. One of the main reasons that I avoid doing it is that the tire has a
slightly smaller contact patch (hence the reduced rolling resistance) which
creates a potentially unsafe vehicle handling profile. Less rubber on the
pavement just isn't healthy, even if it helps to conserve fuel. Also, the
tire height is changed which slightly raises the vehicle center of gravity,
again affecting handling. And the change in tire height could change the
readout of the speedometer and odometer leading to a false sense of fuel
Oh yeah, the tire tread life is reduced when the tire inflation isn't kept
at the manufacturer's recommended pressure. This causes premature wear
leading to more frequent replacement of the tires, with the associated
Dollar for dollar, a slight improvement in fuel economy by overinflation of
the tires seems like a penny wise yet pound foolish approach..
I'm dragging this out of my 2nd year engineering class (a long time
ago) by I seem to recall reduced rolling resistance (hysterisis) is a
function of the reduced movement and bending of the tire molecules due
to the higher inflation. I may well be wrong, but I don't believe it
is the smaller contact area.
That sounds reasonable. I can't see why a bigger footprint *itself* would
be the cause of more rolling resistance; it would be the increased
deformation of the tire materials with lower inflation that would suck up
energy (and - not mentioned - convert it into wasted heat).
Blinky RLU 297263
Killing all posts from Google Groups
I've learned something! I always thought that the larger contact area meant
more drag because of the greater surface area in play. I suppose that in a
non-pneumatic mechanism that might be the case, but I'm starting to better
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