when I lived in Denver, I took our Pontiac to the dealer and they had a high altitude chip for the computer. The documentation on the chip said that it changed the timing of the electronic ignition by 2 degrees, what I don't remember is whether it advanced or retarded the spark.  The new chip increased MPG and HP at high altitudes.
 
Geoff
 

A properly designed electronic fule injection system with a mAP
(Manfold Absolute Pressure) sensor, and a lamda O2 sensor should
compensate for high altitute without a chip change.
(Sarcasm filter failure)
Oh, it was a GM!

Does the 2002 CR-V have this??



Martha



--

musik54@attbi.com

Pam,
It looks like I opened a can of worms with my calculations for
mpg. If I had realised that the group members were so on the ball I
would have gone into it a bit more carefully. Over here we have a
magic number for converting mpg to litres/100 Km. With Imperial this
is 282, and, using my conversion factor of 1.33(different from the
other figure of 1.2 which I have seen in this forum; tell me if I am
wrong!), this comes to 211.5. Dividing your figure of 20 mpgUS into
211.5 does give 10.6 litres/100Km, which is what you got. As an
answer to the questions re mpg and altitude, my 2002 V has only used
one tankful so far and I measured 9.5 litres/100Km. This equates to
22.3 mpgUS, which, considering that I live at an altitude of 3500
feet ( Blue Mountains, West of Sydney), and the engine is still very
tight, is quite satisfactory.

Keep your calculator handy( I will be from now on ).

Loz

..you should have realized that ANYONE who chooses to own a CRV is at the 98
percentile of the population in intelligence. :-)

Rick A. Shay
Colorado

YES

I am getting 20 to 22 Rural and around town with no freeway.
2002 EX automatic.

2002 CRV EX 5SPD - 25.8 MPG, 80% 75 MPH, avg temp at 36 deg
- 22.8 MPG, 80% 75 MPH, avg temp at 2 deg

I expect MPG to increase this summer by at least 2 MPG, winter fuel
will not be used by then.

How big are your gallons?
I know Canada uses Imperial Gallons rather than US Gallons.
What is the UK Gallon?

I know we agree on what a Mile is, but I could ask just to upset my
boss (I work for a Brit. Hell of a nice guy, even if he does like his
beer warm!)

Sorry, Brian, you've got the solution backwards, I believe.

You mention your altitude. Does it affect the mpg significantly? Do you know if there's a formula for how many mpg you lose per thousand feet. I'm up at 2000 feet here. Are you taking into account things like winter gas (I was never quite clear on what they do to it in winter) and cold temperatures?   P

Am I correct in thinking you meant an imperial gallon is 4.54 litres and a US gallon is 3.4 litres?
 
If so the conversion from U.S. gallons would be:
 
miles/gallon x km/mile x gallon/litre --> mpg x km/(5/8 mile) x gallon/(3.4 litres)
 
(so miles and gallon would cancel out and you'd be left with km/litre )
 
Which, I think ends up to be approximately  km/litre = 0.47mpg. So 20 miles per gallon would be equivalent to 9.4 km/litre.
 
To get litres/km, just invert the km/litre, which in this case would give 0.106.
 
And to get litres/100 km, multiply that by 100, giving in this case 10.6 litres/100km. That sound about right? P

Asheville, NC, Mt. Mitchell is 6840ft highest point east of the rockies in the USA.  I see a 2-5mpg drop due to the altitude and the steep grades, glad I have a 5-Speed wouldn't want to drive the Blue Ridge Parkway with an Automatic.
SALTMAN

What benefits would a 5-speed give you wver automatic that would make it so much better in those conditions?  P

> Message: 6
>

38.4 MPG is just NOT POSSIBLE with the CRV not unless you already
have a hybrid CRV, if there was one.

I've never seen a formula for a MPG drop. Pamela, but here is some info off the Web:
 
"Oxygen levels found at 5,000 ft. are a full 14% less than levels found at sea-level.
At 10,000 ft. this percentage loss of oxygen now approaches 30%. As carburetor
jets remain fixed, the diminished oxygen in the thin mountain air will burn poorly
with the carb's fixed amounts of fuel. The logical outcome is black smoke from the
tailpipe, and poor mileage, and significantly reduced power outputs."
 
"It follows then that less of air molecules resting and pressing above our throttle plates
at 10,000 ft. will fill our motor's cylinders less effectively when the piston travels down.
Furthermore, this slower fill rate is now at odds with the sea-level designed camshaft
timing values. The mechanical time the valves are open will remain the same, yet due
to the reduced atmospheric pressure, far less mixture will enter the cylinders."
 
Those two paragraphs

when I lived in Denver, I took our Pontiac to the dealer and they had a high altitude chip for the computer. The documentation on the chip said that it changed the timing of the electronic ignition by 2 degrees, what I don't remember is whether it advanced or retarded the spark.  The new chip increased MPG and HP at high altitudes.
 
Geoff
 

A properly designed electronic fule injection system with a mAP
(Manfold Absolute Pressure) sensor, and a lamda O2 sensor should
compensate for high altitute without a chip change.
(Sarcasm filter failure)
Oh, it was a GM!