A friend is getting a new Toyota Tacoma, the V6 model. I asked him if it was worth getting the V6 since, since they burn more gas, and he said it burns the same amount as the 4-cylinder. I checked toyota's website, and he's right. Toyota Tacoma stats 4-cyl (159hp, 180ft-lb torque) gets 21mpg in the city V6 (236hp, 266ft-lb torque) gets 21mpg in the city The V6 has way more power, way more torque, and burns the same amount of gas. It's not a weight issue. 4-cyl is 3455lb V6 is 4129lb The V6 is much heavier, and it still burns the same amount of gas. How does this compare to vans and SUVs from the same company? The Toyota Sienna (van) has 266hp, 245ft-lb torque, weighs 4140lb, and still gets 24mpg in the city. This van has more power and torque than the 4-cylinder Tacoma, is close to 600lb heavier, and it gets about 20% better gas mileage? Maybe Toyota just doesn't know what they're doing. Look at GM instead. Chevy Silverado 4.3L engine gets 20mpg city 4.8L engine gets 20mpg city 5.3L engine gets 19mpg city 5.3L hybrid gets 21mpg city 6.0L engine gets 17mpg city Basically everything has been isolated and shown to have no difference. Does weight affect a truck's gas mileage? No. Does engine size affect gas mileage? No (until you get up to 6L in size, then yes). Does having a hybrid help? No. Why do trucks get such bad mileage?