Question about Garmin StreetPilot c340 GPS Receiver

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MILEAGE DIFFERENCE I just got my new C340 Streetpilot.the mileages are off by between 20 and 60 miles. I take a trip on a regular basis,and it is app. 91 miles the Garmin displays it as 63.3 miles.Another is 326.7 actual miles the Garmin displays it as 274.4.Can anyone tell me how to correct this.

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  • Ron Chinnery May 11, 2010

    How are you askign your C340 to report the trip mileage?



    Do you create a Route?

    If you use the GARMIN suggested route, do you follow it exactly?



    Just to be sure, do you have the Navigation - Route Preference set the way you would use it... favoring Faster Time, or Shorter Distance?

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Your home setting is correct? My daughters was not and her mileage was off.

Posted on May 24, 2008

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Low gas mileage city and hiway @ 4-5 MPG below MSRP sticker data of 15 and 21MPG on a NEW 2013 Silverado. 2000 miles on odometer and mileage not improving.


is this calculated mileage or what the estimated mileage is showing on the dash. Have you checked to see what you get on just the freeway?

What are your driving habits like?

How is your tire pressure?

Do you make a lot of short trips?

Apr 11, 2013 | Cars & Trucks

1 Answer

After getting gasoline, it increases wrong mileage with camry 2003


One tank of gas is not enough to compare mileage. Or are you saying the computer's readout of mpg estimate is showing less? Try a tank or two of premium and see if that helps. Keep track of gas mileage. Driving techniques have a lot to do with gas mileage, as does long trips vs. short trips, highway cruising vs. city driving. For best mileage, do regular maintenance and keep the car in top running condition-good spark plugs and clean filters and clean oil ! Attend to minor problems before they escalate.
If you want to check actual miles per gallon, start with a full tank. Write the odometer reading down, and go. Everytime you put gas in, write down the amount. When you are close to 1,000 miles from the time you started, go fill the tank and include that amount of gas to your previous list. Now add up all the gas used and divide it into the miles to get miles per gallon. (976 miles/31.8 gallons = 30.69 mpg ) . Only one tank will skew your numbers, might be off cause the tank was filled more to the top than the previous fill-up. About a thousand miles of driving will give you a very accurate figure of miles per gallon for your car.

Jun 21, 2012 | 2003 Toyota Camry

1 Answer

Why is my 2005 accent going through so much gas? I am thinking a fuel leak somewhere.


You generally would smell a fuel leak. The Accent is a fuel injected vehicle, if the system were leaking, it would be at over 20-40 PSI even at idle, and a fire would be possible and you would know it.

You need to make sure your mileage is low by figuring your MPG (miles per gallon) on a regular basis. Fill up at a station on level ground, reset your trip odometer to keep track of your mileage, drive out that tankfull and go back to that same pump and fill up the same way. Stop at the first click and then do the math. The number of miles since filling up, divided by the number of gallons it took to refill it, give you an average Miles per gallon for your car.

If you compare your figure to the normal specs for your car, you'll know if you need a tune up, new tires, or just to change the old driving habits.

You can use any station with a level filling area, it's just much easier to be more accurate when you use the same station repeatedly with the same pump & setting the handle at the same speed to fill.

Good luck !

Mar 29, 2012 | 2005 Hyundai Accent

1 Answer

HI I've got T'birth 900 1997 and have big concern about fuel consumption. It does about 27mpg and I do think that this is way too much. How can I improve range of my bike???


Accurate gas mileage is difficult to determine due to the constant variations in driving conditions and styles. Even the conversion mathematics can cause what appears to be low gas mileage. With a motorcycle higher and lower mileages can be made due to wind direction and if the motorcycle has a windshield, single rider or two. Hera are a few points to check, adjust and consider for better gas mileage.
First the tires make sure they are at the proper air pressure the manufacture recommends.
The tires are of the correct size for the motorcycle, oversize tires will through off the odometer and cause a faults reading.
Another is that the speedometers/odometers on motorcycle are notoriously inaccurate, compounding the problem with gas mileage.
Make sure your drive line is in good order, I believe your motorcycle is chain driven so make sure it is properly lubricated and the sprockets are in good serviceable order.

Things to do mechanically to improve gas mileage.
Have the engine serviced at regular intervals. All lubrication's are not created equal, switch to a motorcycle grade of synthetics using a new oil filter at each change. Make sure the ignition and valve timing are within specifications and the valves are adjusted properly. With a multiple cylinder engine the carburetors must be balanced and the recommended grade of gas used. As mentioned above make sure the tires are in good serviceable condition, properly balanced, aligned and at the correct pressure.

Now for the rider.
If you are flogging this thing at every stop light, seeing red line every day, burping the throttle on down shifts, spending time sitting in city traffic or carving canyon switch backs and hair pins on and off the throttle then there is no way you are going to get good gas mileage.

Riding the motorcycle as you would normally. Every bike I've had, has had an odometer and or trip odometer, so you can see what your driving style is actually doing for gas mileage. fill the gas tank set the trip odometer to zero and then ride it 100 miles (give a couple miles either way) then fill it again to the same level. I generally fill so the gas level is just at the bottom of the neck. Then write it down the cost and gallons (liters) the trip mileage and the odometer mileage. Do this for five 100 mile fill ups then take you gas mileage from that.

The next test.
Do the same test above but alter you driving habits, ride the motorcycle conservatively, no red line, no burping the throttle on down shifts, limit your time in traffic by leaving earlier or later to get around the traffic congestion. Keep your speed down to the limit or a touch over, limit the weight of the gear or two up riding. Do this and you will see a huge difference in you gas mileage and when I say huge I'd say taking your 27mpg and stuffing that up to 50/55mpg.

I'm in Canada so our five gallons is the US six gallon so this comparison will be off but the difference between the numbers will be seen.
My GL 1000 Goldwing average 40mpg in the city only 47mpg on the highway.
My GL 1500 Goldwing average 42mpg city and 58mpg on the highway with two up and 50 pounds of gear
My 750 Magna average 42mpg city and 55mpg on the highway single rider light on gear
Previous to the Honda's my 650, 750 and the "new" Bonneville all gave me 38mpg city and averaged 48 to 50mpg highway.
Hey I've written a small novel here but I think you can see that gas mileage and motorcycle has a lot to do with riding style.

Cheers Live to ride and Ride to Live

Dec 30, 2010 | 1996 Triumph Triumph Thunderbird

2 Answers

OIl, synthetic or regular, what's the difference?


Synthetic oil won't break down as quickly as conventional oil, gives better protection and longer life. Excellent product, I Strongly suggested for those out there who forget to do their oil changes regularly or courier/ work vehicles.
Heres the link to an explaination from Castrol
http://www.castrol.com/castrol/genericarticle.do?categoryId=8264018&contentId=6003233
I use conventional Oil in my jimmy with 5% of Lucas engine oil treatment and service the engine every 3,000 miles. I find it to costly for the Synthetic oil every 3,000 miles, and as for the high mileage oil you can buy. The high mileage oil has a higher fluid retention like adding Lucas engine oil treatment to any conventional oil, so you decide on what type of oil you like to use in your engine.
Good luck and hope this helps.

Mar 07, 2010 | 2004 Toyota Tundra

2 Answers

Why does my 1997 c 1500 waste alot of gas its a v8 5.0 but it hogs that gas prob. 15 mpg freeway


Hello there:
If you look at your owners manual it will tell you that it is recommended that you only use the 89 or greater octane fuel and any thing below this can damage the engine i have the same truck and i have dome a lot of testing with the different fuels and they are right if i spend the extra 5 or 6 cents to get the good fuel i get better fuel mileage along with following the a regular tuneup intervals and also keeping the tires properly inflated helps out a lot ok So try these easy steps and you will find out that you will start getting better mileage

Dec 16, 2009 | 1997 Chevrolet C1500

1 Answer

Is 60,000km's alot for a 2003 v-rod?


Well, let's look at it this way. The bike is six years old so that's 10,000km's a year. Here in the states, that would be 6,200 miles per year which is considered high mileage on a motorcycle here. Most riders here are recreational riders rather than transportation riders and their mileages usually is about 2,500 miles per year.

More importantly than the total number of miles on the machine is the quality of the upkeep on the bike. Has the oil been changed on a regular basis and has the little things that go wrong with a daily ridden bike been repaired. I've seen bike with that much mileage on them in great shape but bikes with much less mileage in terrible shape.

Next, it the bike appropiately priced having that much mileage on it? You should be able to go to a bank and find out what the value of the bike is. Make sure you ask them about the mileage factor.

Good Luck and Ride Carefully

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1 Answer

Code P1739


It's a "Problem in 3rd Clutch Pressure Switch Circuit".

Don't know your mileage, but Honda has increased the warranty on certain automatic transmissions to 7 years or 100K miles. Yours may fall under that.
Time for a trip to the dealer, Honda will even do the
warranty fixes if you're above the required mileage (on a case-by-case
basis)...hope this helps. if so, please leave a positive feedback for me....many thanx

Aug 11, 2009 | 2001 Honda Odyssey

2 Answers

I don't know what oil to put in my 1995 Cadillac deville it dose not say synthetic or regular


Reqular or synthetic. The choice is yours. If you tend to run over the mileage when it is due for changing, I would recommend synthetic, if not, regular works just as well.

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2 Answers

Mileage jumped 400 miles overnight and was not driven


Well either the instrument cluster is defective or you have children that borrow your car when you are sleeping.

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