quantified by TRW
EPS is extremely efficient when compared to a power rack and pinion pump, using only 10 percent of the energy and only when the driver demands it. With no energy drag on the engine, EPS systems offer a fuel savings of up to 0.33L/100km, with a corresponding reduction in carbon dioxide emissions of approximately 8g/km.
Electrically Powered Steering | TRW Automotive
using .33l/100km figure, if youre getting 19mpg in your jeep, using .33l/100km would put you around 19.5mpg
and same .33l/100km would take a 41 mpg car to about 43.5
im sure this wouldnt be quite right because the fuel consumption due to the power steering should be relative to the size/weight of the vehicle