Don’t blame the Jeep the formula holds true for any vehicle.
Which tells me that when you’re driving a truck that weighs quite a bit more than two tons (4,665 curb weight for the V-8 Limited and 4,441 for the V-6 Laredo), you pay through the nose for gas. My results, according to the computer: 16 mpg. So I wanted to compare a similar Grand Cherokee with the less powerful V-6, rated by EPA at 17 city and 21 highway. My results, during a week of fairly conservative driving mostly on the freeway, was a paltry 15 mpg overall, according to the on-board computer. According to the EPA, the mileage rating for this vehicle is 15 mpg city and 20 highway. Gas prices already had reached $3, so I was sensitive to what this midsize SUV was guzzling. Last year, I drove the revamped Grand Cherokee powered by a 4.7-liter V-8, the smaller of two V-8s offered. My recent experiences with a Jeep Grand Cherokee Laredo illustrated this lesson. Maybe something like: mass plus wind resistance times the weight of your right foot equals an empty wallet at the speed of light squared. I’m not sure how a physicist might write the formula. The bigger and heavier the vehicle, the more fuel it takes to move it even if you choose a smaller, more fuel-efficient engine.
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