"When my partner lived in Newcastle, she'd travel to see me at about 80mph. She'd get about 40mpg. I'd do the trip in the same vehicle, at 60mph, using other traffic as wind-breaks, and get >65mpg. "
So from this I conclude that she was 4/3rds as keen to see you as you were to see her. Bit of an indictment, eh?
( Actually I thought you were going to go on to set a problem about men filling a bath with five buckets, etc...)