I did some testing and found that on the highway, that if I have the Jeep roofless, it gets almost identical fuel economy compared to if the hard top was on. I am also in the process of testing to see if the soft top/bikini tops vary as well. (From what Ive seen, the bikini top I have DOES decrease fuel economy; and the soft top is slightly less than the hard top/roofless).
I drive 50km to work each day, and I keep a constant speed of around 120km/hour. Im sure at different speeds the fuel economy would change, but I just felt like spreading this information (although Im sure most of you knew this already).
I would see a very slight increase in mpg during the summers in which I would take my hardtop off. I think taking it off made it more "aerodynamic" because I get a lot of wind noise from the top of my windshield with the hardtop on. That plus the reduced weight is my guess.
Your driving a vehicle with the aerodynamics quality's of a piece of ply wood, anything can cause mileage differences, unless you are pulling a sail, I can't imagine there are going to be huge differences, that can really be related to tops.
next time you fill the tank up reset your trip meter. Then when you go to fill up the next time you divide the mileage by the gallons of gas it took to fill it back up. That gives you your mpg.
I think it's interesting at least, we are not going to get great gas mileage, but it's still interesting to see the differences.
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