New-vehicle fuel efficiency rose slightly last month as Americans bought fewer trucks and SUVs than in December.
April Fools! That dip in new-car fuel economy during the fourth month of this year was in fact an aberration. The University of Michigan Transportation Research Institute (UMTRI) calculated the weighted average of new-car fuel economy and determined that new car month-over-month fuel economy in May rose for the fourth time in five months. Better yet, May represented a monthly record high.