I just saw a video of a guy halfheartedly trying to hypermile his Hummer H1. He managed a 0.5 mpg increase, up from 11 mpg.


That got me wondering... I know the X100 is a fairly aerodynamic car. What is the drag coefficient on these cars? I imagine the coupe is more slippery than a convertible. What effect does the covertible top's material have on drag?

On the subject of hypermiling. What kind of mpgs could we expect to see if we cover the panel gaps with painter's tape? On the highway, what is the optimum speed for squeezing extra mpgs? How much of a mileage improvement do the 6 speed cars over the ones with the 5 speed transmissions?

I get somewhere around 24 mpg on the highway if I'm driving like I stole it, 29 if I drive normally, and about 32 if I hypermile at about 60-63 mpg.

 

Several weeks ago, I posted some info gleaned from "The Net" stating the coupe C/D range is between .32 and .35. The Vert is .33 to .36. Still good for older cars. Hope this helps :-)

 

I've done a few similar challenges myself, not exactly hypermiling but close
Once with my Audi A6 and more recently with the Jaguar XJ X358


The A6 would get around 37mpg stop / start around town and driving normally, maybe with a few blasts thrown in up to 45mpg on the motorway there or thereabouts.


Once I really tried to see what I could get, driving at around 60mph on the motorway, hypermiling, coasting downhill, slip streaming behind cars, buses etc and did actually see 61.3 mpg at one point.
Normally I'd get around 500 miles from a tank, during the hypermiling test I managed a staggering 795.5 miles from one tank!!
This wasn't even really trying the whole time, I estimate that 900 miles or more could be achievable.


The Jag XJ X358 normally gets around 29mpg around town and about 38mpg on the motorway, maybe a little more with about 450 - 500 miles to a tank


On a recent trip nearly all motorway with a little stop / start thrown in, I tested it out.
At one point the most I saw was 47.1mpg and I managed somehow to get 716 miles from a tank of fuel, which was pretty amazing for such a big heavy car I thought.


The truth is a todays prices here in the UK the difference between driving "normally" with a little blast here n there, or driving carefully / hypermiling can be very expensive.
I estimate that anywhere between £700 - £1200 per year could be saved if this technique was employed all the time.


However, and having said that it would bore you to tears, I promise you, so so boring and time consuming.


But - driving a little easier and being just a little more aware and upping your mpg by 5 or even 6mpg can result in significant savings over the course of the year