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Originally Posted by ghodlur @nairrk, I can vouch for it. I drive @ 60-65 kmph on highways and regularly have got 15 kmpl for my Fiesta. I expect that to increase after first service hopefully  . I also make it a point to rev the engine till 3000 rpm atleast once a week, mostly Fridays when I have to rush home and if I get a clear stretch. |
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Originally Posted by nairrk In my recent long drive to Chennai and back, (since roads from mysore-bangalore and again to chennai are of in good condition) my car was always flying at 100+ kmph and occassionaly upto 150kmph. The mileage I got this time is only 13.5kmpl (70% A/c- I switch off the a/c for some time when the cabin is fully cooled).
However in my last drive to Guruvayur, I maintained a speed of 80/90 and sometime
touched 100 (fearing that the cops may appear anytime with a speedgun). In that drive I got a FE of about 15kmpl. So it means that high speed drinks more fuel than normal speed?? |
Between 80-100 is the ideal speed I found for acceptable FE of 12/13 as well as safety/driveability/comfort etc. Anything above that is pushing luck too far on Indian road conditions.
The recent ads by PCRA about saving 20% on fuel when you drive at 45-50K - what you guys have to say on that?
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Originally Posted by shajufx Although there are many threads mentioning the 'windscreen fogging' and the 'AC settings' in detail, I just want to clear some confusion here. I dont really agree with the fact that inside temperature has to be in line with the outside temperature. In a place like Ooty or Shimla, do you use the cooling or the heating in a car ? So is it not totally different sides of the temperature ? What about the middle east heat ? It goes above 50 degree in the peak months and many people even die of heat strokes. So thats another extreme situation, do you set the thermostat in line with the outside heat ?
Personal experience: There is never a fogging when the AC is working in a comfortable temperature (22 to 24) inside the car. Bangalore has 13 to 17 degrees in December and goes above 35 in the summer. But my fiesta AC is ON throughout the year regardless of the temperature outside. Never seen fogging. |
This is a controversial topic and lot of factors are at play here like moisture content, driving/air current speed, cleanliness of the glass, water buildup in the HVAC system, blockages in various vents.
Fogging can happen from inside as well as outside.
Following are the problem areas
1. Ensure to keep the glass inside/outside free from smoke/grease/oil/duct etc, otherwise the dehumidication effect will not function properly. While we can easily clean the glass from outside, inside is a real pain, and most of the time this becomes the culprit.
2. If the fogging is persistent, then it might be an issue with water getting trapped in the HVAC system, which is getting released.
3. Sometimes if more people are sitting inside, it might be useful to let outside air in. Fresh air may contain less moisture than the amount of moisture being generated by the breathing inside.
4. In extreme conditions, the temp in the cabin should be gradually brought down rather than starting with the lowest a/c position. This results in quick chilling effect on the glass areas where the airflow is direct (mostly bottom of the windscreen) and then it start fogging from the bottom up. If a gradual lowering of temp is done, the glass gets enough time to cool uniformly.
The bottomline is this..fog will form when moisture content is high..one needs to control the moisture content (by dehumidification) as well as ensure that water cannot settle on surface (by keeping it clean). There are various techniques and no single solution for this.
Read it somewhere..take a white wax crayon or a candle and draw a line on the glass..then rub it with a clean cloth to spread the line uniformly over the entire glass so that it becomes invisible..this way a thin wax layer forms which will keep the moisture from condensing. Have never tried it though.