B.S. It takes more energy to go a faster speed on average. Try peddling your bike at 20 and then 30 mph to see what I mean. However, mainly because of the non-linearities involved in the transmission of the vehicle, as well as programmed changes to timing and injection, and dynamic changes to load, it is likely the efficiency curve is also non-linear with some spikes and transitions. Therefore you could probably find two adjacent speeds, say 56 and 57 mph, where the higher speed actually has lower fuel use. But between 60 and 75, no way. An inline fuel flow meter would make that very clear.
Who the hell really cares how much fuel is consumed driving "X" mph vs. "y" mph? Thats just a clever re-run of the Carter Admin. tellin you that your govt. will fine you if you consume too much gasoline by driving too fast.
It was bogus legislation then and it's still bogus today...........
As usual, it's OUR fault isn't it? Almost 30 years has passed since that debacle and nothing was learned from those days was it? No new refineries, still sanctions on offshore drilling, still fighting the F'n lawsuits prohibiting us from additional natural gas and oil drilling..............
DON'T PREACH TO ME ABOUT 55 MPH GAS CONSUMPTION VS. 70 MPH GAS CONSUMPTION! I'VE HEARD IT ALL BEFORE AND IT WAS BULLSHIT THEN JUST AS ITS BULLSHIT NOW..........