this post was submitted on 05 Jul 2024
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This is correct, especially at lower speeds. Greater fuel efficiency would come from lower wind and drivetrain resistance and use of a more efficient range of the motor’s powerband.
Most vehicles are geared for optimal speed to fuel consumption around 55-65 mph (90-100 kph) not 70+ mph (110+ kph). So just going a bit under the speed limit can have a significant impact on fuel consumption.
Also, truckers drive efficiently, so just following what they do will save gas.
But yeah, I don't go over 65mph and I end up with 7-10mpg over my highway rating.
I have no idea what mpg are exactly, but my car uses 5 liters for 100km when I drive it.
The official rating is 7, and most car magazines at the time it was new claimed that it's unrealistic cause it actually "needs" 8.
When I went to the shop because my brake discs were rusty, the mechanic told me "yeah well you're supposed to use them once in a while".
Edit:
8 liters/100km = 29 mpg
7 liters/100km = 34 mpg
5 liters/100km = 47 mpg
Yeah, I got my last vehicle new, and went 165k miles (~265k Km) on the front brake pads. At every tire rotation I asked if I needed new ones, and for like 6 years they told me they were at 50% wear.
I use throttle control to adjust my speed while driving, and coast as much as I can at redlights.