100 MPG cars?
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Discussion

Huntsman

Original Poster:

9,333 posts

279 months

Wednesday 15th June 2011
quotequote all
I'm still committed as I ever was to make sure I get my fair share of the petrol...

However, I've been thinking about buying a car that does about 15 to the gallon and having a second car to do the daily grind to work, but its barely worth the cost of running 2 cars and suffering the agro.

Is there anything that really will return 100mpg on the motorway? Would a remapped TDI smallish hatch back do it?

I could live with a Pantera (my motor of choice), but I think it would be prudent to have a smallish diesel to go with it?

Fume troll

4,389 posts

241 months

Wednesday 15th June 2011
quotequote all
100mpg at 70mph? I think it's going to have to be a bike / scooter.

Cheers,

FT.

GroundEffect

13,864 posts

185 months

Wednesday 15th June 2011
quotequote all
A small diesel hatchback will never return 100mpg on a motorway. Probably around 70 max.

J4CKO

46,836 posts

229 months

Wednesday 15th June 2011
quotequote all
Any car will return 100 mpg, with a long enough hill and no engine !

A Honda C90 Cub may be what you are after, realistic 120 mpg.

5lab

1,920 posts

225 months

Wednesday 15th June 2011
quotequote all
polo\fabia\ibiza bluemotion or whatever the greeny cars are called claim 94mpg extra-urban. At a sustained 55 you could probably see 100mpg

Edited by 5lab on Wednesday 15th June 17:14

Thesaint01708

935 posts

186 months

Wednesday 15th June 2011
quotequote all
Theres a guy who famously gets 100+mpg from a honda insight although he must drive it like Ms Daisy to get that kind of figure

We've had 80mpg with a mixture of driving - but you have to keep to 60, that extra 10mph ruins everything!

tyranical

927 posts

219 months

Wednesday 15th June 2011
quotequote all
Running two cars is never going to be cheaper than running 1, never ever ever.

Once you take into consideration the cost of buying, insuring, servicing etc etc etc of both cars your not going to be saving anything you might aswell spend it all on your 15mpg'er instead if you want to do that.

George H

14,714 posts

193 months

Wednesday 15th June 2011
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The Lupo 3L TDI did 80+mpg I think. Not sure how it would fair at motorway speeds though.

sjg

7,677 posts

294 months

Wednesday 15th June 2011
quotequote all
5lab said:
polo\fabia\ibiza bluemotion or whatever the greeny cars are called claim 94mpg extra-urban. At a sustained 55 you could probably see 100mpg
Possibly IF they've warmed up first. Diesels especially aren't great from cold, and modern efficient diesels take an age to warm up. If your trip to work is less than 60 miles, you're going to spend a good chunk of it with a cold engine.

Greg_D

6,542 posts

275 months

Wednesday 15th June 2011
quotequote all
tyranical said:
Running two cars is never going to be cheaper than running 1, never ever ever.

Once you take into consideration the cost of buying, insuring, servicing etc etc etc of both cars your not going to be saving anything you might aswell spend it all on your 15mpg'er instead if you want to do that.
don't be silly, there will be a crossover point, it may be a very high mileage to make it worthwhile, but there will be one!

ETA:just done some maths
difference between 15mpg pantera and 70mpg bluemotion=55mpg
cost of snotbox= £1500pa depreciation,£0tax, £300 insurance, £500 wear and tear/servicing/consumables=£2300

£2300 buys 374 gallons of fuel. Which at 70mpg = a breakeven of 26,221 miles

not extraordinary mileage

Edited by Greg_D on Wednesday 15th June 17:26

5lab

1,920 posts

225 months

Wednesday 15th June 2011
quotequote all
Greg_D said:
tyranical said:
Running two cars is never going to be cheaper than running 1, never ever ever.

Once you take into consideration the cost of buying, insuring, servicing etc etc etc of both cars your not going to be saving anything you might aswell spend it all on your 15mpg'er instead if you want to do that.
don't be silly, there will be a crossover point, it may be a very high mileage to make it worthwhile, but there will be one!

ETA:just done some maths
difference between 15mpg pantera and 70mpg bluemotion=55mpg
cost of snotbox= £1500pa depreciation,£0tax, £300 insurance, £500 wear and tear/servicing/consumables=£2300

£2300 buys 374 gallons of fuel. Which at 70mpg = a breakeven of 26,221 miles

not extraordinary mileage

Edited by Greg_D on Wednesday 15th June 17:26
I don't think your maths is right. you want to work out the 374 gallons of fuel @ 55mpg (the difference between the two) - so just over 20k. also, the wear/tear, depreciation etc is probably removed (in part) from the nice car.


tyranical

927 posts

219 months

Wednesday 15th June 2011
quotequote all
What about the other car?

You've still got all the costs associated with that to add into your yearly motoring bill.


Emubiker

954 posts

209 months

Wednesday 15th June 2011
quotequote all
5lab said:
I don't think your maths is right. you want to work out the 374 gallons of fuel @ 55mpg (the difference between the two) - so just over 20k. also, the wear/tear, depreciation etc is probably removed (in part) from the nice car.
I worked out it was cheaper for me to buy the rover 45 diesel, run it daily, insure and tax it then sell it for £400 (just for quick sale purposes), than it was to run my 205 from Stirling to Edinburgh and back each day.

It really was a no brainer as I saved quite a bit, and kept the miles off the 205.

5lab

1,920 posts

225 months

Wednesday 15th June 2011
quotequote all
tyranical said:
What about the other car?

You've still got all the costs associated with that to add into your yearly motoring bill.
right but they decrease (if anything) when you add a second car, so would reduce the miles needed to break even

sa v8 mate

513 posts

193 months

Wednesday 15th June 2011
quotequote all
My mate's just done all the maths on running a 2 car system, i.e, a smoker for the weekends and an econobox for his daily 35 mile round trip. Just bit the bullit and uses a 3.2 Y reg Jag for both jobs. Uses about £80 a week in juice, but all the other costs aren't that much different. He's quite handy with the spanners and we know a good mechanic, plus he looks forward to going to work every day.

Huntsman

Original Poster:

9,333 posts

279 months

Wednesday 15th June 2011
quotequote all
You've mostly concluded exactly what I have, which is that the plan of having some super economical shopping trolley to trundle up and down the motorway to work does not pay.

This is great news...I get to smoke around in some cool machinery and can argue that its cost effective!

One thing that works in my favour is that I commute at rush hour on a busy motorway, I just dont get the opportunity to hammer along, its a 60mph trundle, that means what ever monster I choose to have does reasonably well on mpg.


tyranical

927 posts

219 months

Wednesday 15th June 2011
quotequote all
5lab said:
right but they decrease (if anything) when you add a second car, so would reduce the miles needed to break even
Can you explain how owning 2 cars makes the total bill of depreciation, insurance, tax, mot etc which your now paying for 2 cars instead of 1?

The only saving you will potentially make is on fuel, that saving needs to be more than the costs of all the above on both cars.

TotalControl

8,307 posts

227 months

Wednesday 15th June 2011
quotequote all
Was there not a particular Audi A2 that did 100mpg?

5lab

1,920 posts

225 months

Wednesday 15th June 2011
quotequote all
tyranical said:
5lab said:
right but they decrease (if anything) when you add a second car, so would reduce the miles needed to break even
Can you explain how owning 2 cars makes the total bill of depreciation, insurance, tax, mot etc which your now paying for 2 cars instead of 1?

The only saving you will potentially make is on fuel, that saving needs to be more than the costs of all the above on both cars.
yeah but he wasn't counting the bill for the first car in either cost 1 or cost 2. The only runing costs for car 1 he included was fuel. in fact lets say for 20k per annum

3 year old focus st : 25mpg average. 25k is going to depreciate it by 3k/year, running costs 2k/year

3 year old focus st : 25mpg average. 5k is going to depreciate it by 1k/year, running costs 1k/year
1 year old polo bluemotion : 70mpg average. 20k is going to depreciate it by 2k/year, running costs 1k/year

total running costs are broadly the same, leaving only insurance as the additional cost, but saving 20k @ 45mpg = 445 gallons of fuel = £2800/year.

you can twist the figures to make it work more or less well, but I recon using those figures, 2 cars over 25k would save you £2500/year all in. not bad!



tyranical

927 posts

219 months

Wednesday 15th June 2011
quotequote all
Your figures are fictional, unrealistic and you've not taken everything into consideration so how they are meant to prove anything I don't know.

You also haven't accounted for unplanned maintenance, tyres etc.

When you add up every single cost of owning and running a car properly and with factual figures you'll soon see its not going to save you any money at all owning them both unless you are doing a colossal amount of miles or planning to own them for a very long time.







Edited by tyranical on Wednesday 15th June 22:26