Coming back from Toronto, cruising at an average of 70.5 mph with the top up, I averaged 30.1 mpg.

Last weekend, same speed, highway cruising, but with the top down : 24.7 mpg. :eek: I had my gf and the kids with me, if that makes a big difference (roughly 220 extra pounds).

Thought I'd share.

Weird :confused No ideas here though...

Well, I'm not that surprised. Dropping the top creates a huge vacuum behind the windshield. Shows how bad it is.

I believe someone once made some tests regarding A/C use vs. having the windows down, and the results were the same :

Windows up = good mileage
A/C = worse mileage
Windows down = worse than windows up, but similar to A/C

:(

:lol

Isn't this the part where someone says, "If you're worried about the gas mileage, you should get a Hon-duh!":D

I never took the time to run a full tank of gas with the top up to figure out the difference. Thanks for sharing. For me, the gas mileage measurements went something like this:

Driving around town: 19 MPG
Freeway driving to an autox, the autox iteself and the drive back home: 24 MPG
So now I autox as often as I can to get better mileage.:redspot

I did find that if I was really careful with the accelerator to the point of being annoying to other drivers on the road, I could get 21 MPG around town.

Scott

Yep Drive as if you have an egg under your feet. Mileage improves significantly.

Bump, since mileage for 328s is on the menu... :)

It's the same as when you have a pickup truck. I see guys driving around all the time with their tailgates down, thinking they are improving their fuel economy, when , in fact, they would get better mileage with the tailgate up. With the tailgate down a large vacuum is created in the bed of the truck causing drag, with it up air just flows right over the top and bed of the truck.

It's the same as when you have a pickup truck. I see guys driving around all the time with their tailgates down, thinking they are improving their fuel economy, when , in fact, they would get better mileage with the tailgate up. With the tailgate down a large vacuum is created in the bed of the truck causing drag, with it up air just flows right over the top and bed of the truck.

How do I mount a tailgate on my 'vert ... ?







j/k

It's the same as when you have a pickup truck. I see guys driving around all the time with their tailgates down, thinking they are improving their fuel economy, when , in fact, they would get better mileage with the tailgate up. With the tailgate down a large vacuum is created in the bed of the truck causing drag, with it up air just flows right over the top and bed of the truck.

I'm tempted to doubt that. With tailgate down, you have a vaccuum, but the tailgate up creates both a vaccum and a drag (I think).

:buttrock Screw the mileage......have fun and drive it like its a Bimmer!!!!

:buttrock Screw the mileage......have fun and drive it like its a Bimmer!!!!

Huh... an 8 hour Toronto-Québec drive isn't exactly eventful...

beside, I had just gotten my new engine, I was not gonna risk moneyshifting it again.

Driving around town: 19 MPG
Freeway driving to an autox, the autox iteself and the drive back home: 24 MPG
So now I autox as often as I can to get better mileage.:redspot


:lol

If you want a good laugh, reset the OBC consumption just before an autox run. I am not sure what the actual mileage is as the number bottoms out at 6MPG. :eek:

:lol

If you want a good laugh, reset the OBC consumption just before an autox run. I am not sure what the actual mileage is as the number bottoms out at 6MPG. :eek:Unfortunately, I don't have the OBC. :( I've seen ridiculously low numbers from E46 M3's at the atuox though.

Scott

How do I mount a tailgate on my 'vert ... ?
j/k

Well you simply drive UNDER a monster tire pickup truck just one time and...

oh yeah you'll also have a hardtop 'vert as well after that although it won't exactly be OEM. Probably won't do much to improve the MPG either. :stickoutt

26 something with the top down/ 23 something with the top up.... alldone on the same strech of road..... 260 miles. I thought it was wierd also

Coming back from Toronto, cruising at an average of 70.5 mph with the top up, I averaged 30.1 mpg.

Last weekend, same speed, highway cruising, but with the top down : 24.7 mpg. :eek: I had my gf and the kids with me, if that makes a big difference (roughly 220 extra pounds).

Thought I'd share.

you had the top down during a quebec winter? with your family in the car? You are the epitomy of hardcore

My driving is about 1/2 city 1/2 highway. (All estimates are IIRC) Top up I can average about 23 mpg. Top down for the whole tank (yes it's been done several times) I average about 18 mpg.