On Sat, 10 Mar 2018 15:12:08 +0000, ARW
wrote:
Do cars exist that will do 700 miles at 70MPH on one tank of fuel?

My works pug 206 1.4HDI often did over 700 miles per tank and if I
could have maintained 70mph I think it would have been close. It was
scrapped at 305k miles after I retired

Current fiesta 1.4 eco does slightly better mpg but smaller tank.

AJH