Best Answer: There are several factors to consider when guessing gas mileage. If V8s suck more gas than a V6, why does the EPA rate a 1999 Cadillac DeVille at 26 mpg Highway (a big boat with a BIG V8) But only rate a 2006 Chevrolet Impala (Much smaller car with a V6) at 27mpg on the highway? Several factors.

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Here's another one for you, though: A 2006 Ford F150 4x4 V8 is rated at 18mpg on the highway. A 2006 Ford Ranger 4x4 V6 is rated at 19mpg on the highway. Again, a much smaller unit.smaller engine.but pretty much the same gas mileage???

Here are SOME explanations: Transmissions, # of gears and how the gears are spaced. I.e: The Ford 500 has a six-speed or CVT, so it can get much better gas mileage on a V6 than the much smaller Taurus can. Rear Differential ratio.(Simple explanation: The number of turns the driveshaft must turn to turn the tires once). The F150 V8 has a a 3.73 rear end. The ranger V6 has a 4.10 rear end.

So the ranger has to spin the driveshaft more to get the wheels to turn one time. Hence, giving it more low end pulling power, but also burning more gas.

And yes, 'how much fuel does it take to get the load moving'. If you have a box that weighs 100#, A grown man (or v8) should be able to push it across the floor without much effort. A 12 year old boy (or V6) will take a lot more effort to move the same box an equal distance. In the end, the boy will have used more ENERGY (gas) than the man will have.

If your biggest concern with your vehicle is gas mileage, then you have a lot of options. If you need to pull a trailer, or work it in 4x4, or cary a load. You might want the V8. And in response to posters who are slamming the dealers and salespeople. I'll say it again. Car dealers are not out to screw anybody.

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We are trained in product knowledge. We take certification tests, and MUST pass them with 80% or better. Customers are mailed surveys by the manufacturer after their purchase. If a dealership scores poorly, they could loose benefits from the manufacturer. (for example, being Blue Oval Certified) We are trained and expected to talk to the customer, learn what their needs are.then try to suggest vehicles to the customer that will help them achieve their goals. Depends on your needs.

Most full size trucks will come with a V8. Recent technology allows better MPG in V8's by disabling 1/2 of the cylinders when the vehicle does not need them aka accelerating, towing, etc. You know your driving habits best. What are you hauling, towing, etc. 2 other factors that influence MPG as well is the rear end axle ratio. The lower the number the better the mileage but lower towing capacity.

Also whether the vehicle is 2wd or 4x4. A 2wd will avg. 1-2 MPG more because it weighs less (no transfer case, front differential, etc.) Either way Pickups are not aerodynamic by nature, they are meant to serve a purpose. So none have great mileage some are just better than others. Hope this helps Good Luck. If you can afford it I would get a V-8.