Are there any cars that run on petrol or diesel and will achieve 60mpg+ at 100mph?

Dr House · 27 Jan 2013 at 12:36

The ideal car for me would have 300 bhp, petrol, do 60mpg at 100mph

mjt · 27 Jan 2013 at 13:59

I'm sure a VW Lupo 3L could get pretty close, although I don't think it can even do 100 mph

Matt82 · 27 Jan 2013 at 14:10

Insight minus batteries plus a k20 and special gears

Simon · 27 Jan 2013 at 14:20

Why would a K20 help. Why would no batteries help ?

The 1litre 3 cylinder is ideal.

Matt82 · 27 Jan 2013 at 15:41

A car so light and so aerodynamic plus with the special gearing, at 100 the engine wouldn't be working so hard. It won't get 100mpg but can you imagine how awesome the whole package would be?

PMKeates · 27 Jan 2013 at 16:38

I really can't see it..

Jonnycoupe · 27 Jan 2013 at 16:53

You want to work it hard for the BMEP to drive the engine BSFC down.... It has a throttle plate after all.

I should maybe have said K20 y0?

Batteries are good. Do it in daylight and you have hours of running without any charging drag unlike an alternator. Direct injection might have been enough.

VW XL1 will probably be the first and will meet the target and more by quite an amount.

sandys · 27 Jan 2013 at 17:01

Wasn't the Vauxhall Speedster, a fancy vx220 with aero mods and the Fiat 1.3 JTD able to do 113mpg at 100mph.

sandys · 27 Jan 2013 at 17:04

Here you go, its average speed was 140mph over 24 hours with 113mpg, and people moan about Fiat mpgs, it'd do a lot better if it wasn't racing and only doing 100mph I'm sure

http://blogs.howstuffworks.com/2010...pel-eco-speedster-capable-of-113-mpg-in-2007/

Shad · 27 Jan 2013 at 17:18

That's quite impressive. So um... when do we get that in road cars please?

Jonnycoupe · 27 Jan 2013 at 17:20

Just reminded me of that car. Yes good candidate., although it never made production.

0.2 cd and 660kg. 113mpg seems to be the NEDC result so I think that story has simply got carried away. Car is good for 155mph which is very impressive for 112bhp!

sandys · 27 Jan 2013 at 17:24

Well you only asked if there were any cars not whether you could buy it

It is a shame its not available but you could always build one, the engines exist and a couple of kit cars you could start with.

Jonnycoupe said:
Just reminded me of that car. Yes good candidate., although it never made production.

0.2 cd and 660kg. 113mpg seems to be the NEDC result so I think that story has simply got carried away. Car is good for 155mph which is very impressive for 112bhp!

Ah yes a bit more googling it was 141mph average speed and 31.4mpg.

Biohazard · 27 Jan 2013 at 18:03

Negligible drag coefficient for the win. Or fast lorries.

Jonnycoupe · 27 Jan 2013 at 18:08

Like an A380? Small front area also helps

mattyprice4004 · 27 Jan 2013 at 18:41

I've been doing about 85MPH on the motorway and dual carriageway / A road leg of my commute, and returning about 52MPG (about 20% of the drive is 30 zones though, fail).

If my old shed with a 1980s diesel engine can do that, I'm sure that target can't be far off.