yeah my mom had a 80's "mustang" it was a fucking four cylinder, how crass.
It was ironic....in the late 90's I had a danger ranger....2.3....moms had a 4.6 mustang GT....the stang actually got better fuel mileage.
Can I attribute this to power:weight efficiency?
firstly , back in the day, the GT package (for every manufacturer i am familiar with) used a leaner mixture, restricted intakes for lower volumetiric efficiency (hence lower compression), and fewer geegaws to increase it's "Grand Touring" appeal, plus a larger gas tank.
many "GT" cars these days use the GT "badging" to designate a particular trim package rather than it's proper use to describe a modified sub-model designed to let you cruise without stopping for gas every few blocks.
a standard "GT" package car was designed to get better fuel economy than the same car without the GT designation.
these days, not so much.
secondly, the ford ranger pickup often came equipped with a lower gear ratio differential and tranny, for towing and whatnot, while poontangs (as well as all passenger cars) come equipped a much higher gear ratio
the ranger "sport" package had the higher gear ratio (the same as was used in rear wheel drive passenger cars at the time), and was ill suited to heavy work.
thirdly, the ranger had a classic chassis/body design to support the bed and payload, stronger suspension, and was considerably heavier than a poontang, and thus would always lose out in fuel economy to any passenger car, even with the same engine and gearing package, while the GTpackage was even more efficient, but sacrificed some power and speed as a tradeoff.
you cant compare a truck to a passenger car (except "sport" trucks), even the dolts at the EPA figured out that doesnt work.
a ford ranger (non-sport package) could tow your trailer, haul hay or grain, and give good service when you had to carry lumber or concrete, but they were designed for work.
the datsun B2200 or chevy luv (similar in many respects to the ranger, but with a higher gear ratio and weaker suspension) were considerably faster, and more fuel efficient than a ranger, untill you put a load in the back. anything heavier than 500lb, and those turds became a bottom scraping, gas guzzling putt-putt mobile incapable of climbing the mildest of hills.