[Baldeagle]

I've seen published times of 5.6 - to 6.3 for the v6 Sedan. I've also seen the Sport trim post a 0-60 time of 6.6.

I would imagine the 6/6 coupe would no doubt pull a 5.6 but the Sedan? I haven't really given it a try as I have less than 2k on my V6 Sedan.

Car magazines can be very misleading because they weather adjust all times. Car and Driver uses the most favorable assumptions (coldest temperature, driest air, highest air pressure). This means the times they report may not be times you can actually achieve in real life. (Odds are they did NOT get the times reported either.) Plus C&D admits to abusing test cars with brutal launches. They also test their cars on sticky tracks for the better 60-foot times. That is one reason they also state a 5-60 time for a more real life number.

Most stock V6-sedans go through the quarter at 14.3 to 14.4 seconds at 96-98 mph. That typically translates to a 5.8 second 0-60 time. C&Ds 5-60 time is 5.9 seconds.

No, the transmission ratios are the same between the Sedan and the Coupe V6 with the automatic transmission and the EPA HW MPG was rated at 2 more with the sedan even though the curb weight is higher than the coupe.

With regard to coupe’s and sedan’s mpg differences, I suspect that is totally attributed to Honda’s belief that coupe owners will use the paddle shifters to override the computers “best economical choices,” even on the highway! The coupe is sort of penalized for human judgement just like the 6MT gets unfairly hammered.

According to this article, the Hybrid has a drag Coefficient of .29 and is “one tick better than base Accords,” which means the base Accord has a drag coefficient of .30.

2014 Honda Accord Hybrid | car review @ Top Speed

In the past, Honda coupes have always been more aerodynamic than the sedans. But even a .01 to .02 improvement in Cd won't save anymore than 1hp to 1.5hp to maintain 70 mph. That would make the change in aerodynamics impossible to justify the 2 mpg difference between the coupe and sedan. And you stated, the coupe and sedan have identical gears ratios.

 

[Baldeagle]

You might be right about the paddle shifters. The wheel size is also different, that goes into the mix as well. Does anyone know where to look for the EPA MPG math that the manufactures need to follow? I don't think manufactures would dock it unless they were forced to.

According to Car and Driver MPG drops ~1 MPG per 1" upsize. Maybe the rounding requirements is what makes the difference (17"= 33.5MPG, 18" = 32.4MPG). The sport loses 1MPG HWY with it's 18's.

This subject could get very interesting. Rotational inertia can work in both ways. Inertia implies the mass will resist any change in motion (acceleration). When at rest, it will resist positive acceleration. When at speed, it will resist positive acceleration AND negative acceleration. Slowing is negative acceleration. Once at speed the heavier wheels should IMPROVE highway fuel economy because the inertia is now working in its favor to help it maintain speed. It should require less power (fuel) to maintain speed. More fuel to get there, less fuel to stay there. (This assumes steady speed on flat roads.)

Obviously we constantly accelerate and decelerate a little bit all the time on the highway (hills, turns, natural changes in speed, etc.) But once on the highway, I’m not sure how much heavy wheels affect fuel economy. I suspect heavy wheels are mostly a detriment to fuel economy in city driving.

As far as the 2015 Sport goes, the CVT Sport gets 1 mpg less on the highway than the CVT LX, EX or EX-L. However, the 6MT Sport gets the same mpg as the LX and EX 6MT Accord Sedans. The HWY mpg did not change with the 6MT. If there were a difference based on the heavier 18s, the sedan and coupe should be penalized equally but that is not the case.

 

[Baldeagle]

I thought this was a 0-60 thread? I'd like to see more of that... Maybe someone can put up a poll or something? Honestly, it'd be nice to put something together for all trims, engines and transmissions, see where each driver falls on a chart. What's the easiest way to reliably test 0-60? I don't fully trust using a stopwatch, and it'd be nice to have something that could record it automatically for me.

Yeah, we did go off on a tangent. Sorry about that. With regard to reliable tests, I favor videos. Find a flat road, record the speedometer and apply a stopwatch to the video.

 

[Baldeagle]

I have a 6MT too and yes that can be a minor challenge. I held my camera and steering wheel with my left hand and shifted with my right. Once I started to accelerate I didn’t even look at the camera. My eyes were down the road. It was sort of a point and hope video technique. But it did work. The video came out well and allowed me to time 0-60 with my stop watch from watching it on my computer.