as someone stated above, its all abt keeping the RPM low....dirving on 40 in first gear is more fuel consuming than driving on 110 in 5th....so...the question is wrong in this topic...its all abt the RPM at the end of the day.
and abt tyre pressure, i always drive with 32 in all tyres. absolutely fantastic average and comfort too
Plz also calculate how much you actually save by driving slow on motorway and whether it is worth the trouble.
I am visited Karachi to Hyderabad on M-9 in Suzuki Swift with 4 Person 100% A/c.Karachi Safari Park to Safari Park 313 Km Tank to Tank Refill Rs.2290/- 20.15 Liter Petrol @113.6 Average 15.52 Km/Liter.This average include traffic jam in Gai/Bakra Mandi, Sohrab Goth Karachi and Abul Hasan Isphani Road on return Back.You are also welcome to comment on this average good or bad.
Ha ha ha
drive @ 80kmph
My cityConstant at 100.....20 km per literConstant at 120.....17 km per liter Constant at 140.....14 km per liter
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Next time you are on motorway close the windows and turn on AC, you should get better milage.
The best speed is 100kph.
Larger engines are more economical on motor way (as engine to weight ratio is better)