MPG

I keep an eye on MPG, topping up and taking a note of mileage. I am confident that what I am doing is right.
My wife and I have been going for 40 odd mile runs during the last warm evenings, through the country lanes.
Average Speed has been low due to traffic etc.
The last 400 miles has been done at 46mpg !
Couldn't get anymore fuel in and the gauge shows full.
Is this really possible.
99 20v NA, 102,000 miles.

That sounds incredible to me. I had a NA some years ago and got 25-29mpg. My current Turbo gets 23-29mpg. Seems impossible to top 30mpg to me: there's always a stretch of road that demands a fuel-draining burn off after a hundred miles of gentle coasting.

Aye, I think you need to check your figures again, I’ve never heard of a Coop in the 40s never mind 46 miles per gallon. Mid 30s seems to be the figure most attained.

If your numbers are right, that means you have driven approx 640 miles on one tank..?! That sounds pretty incredible.

The coupe fuel tank takes 63 litres so 13.9 (UK-flavoured) gallons or thereabouts. Occam's razor might suggest you forgot to zero the mileage counter on your 2nd last visit to the fuel pump?

Mine doesn't go close to that.

I once managed 43mpg out of my 20VT by driving at tiny throttle openings, zero boost and slipstreaming trucks and vans. It was intensely boring and I never did it again.

I struggle to believe that any Coupe (other than maybe that Chamonix Grenn diesel conversion from a few years ago) could do better than 40mpg in slow traffic on country lanes. Still - anything's possible - worth trying to repeat it, but ultimately, does it really matter, as long as you're enjoying your Coupe on warm summer evenings.

Mix of motorway and fast A roads 19 mpg (E85)

When I used my coupe 20vt as a daily I got 23-25 mpg and the best I got on a run was 30 mpg

A Fiat Coupe ( should be Coupe Fiat I believe but no matter ) sales brochure ( remember them ? ! ) I have lists the following EEC fuel consumption figures for a 20VT.

Urban : 19.6 mpg
Extra Urban : 37.2 mpg.
Combined : 28.0 mpg.

Finger in the air I’d say for my car about 25 mpg for short mixed road use and low 30’s for motorway longer journeys .

As most Coupes will be doing limited annual mileage nowadays smiles per gallon is perhaps more important than miles per gallon .

The relatively large fuel tank and very accurate fuel gauge are a real bonus in my view.

Thanks everybody. I'm checking the next tank full. I can't believe it either. My car goes out every other day, shops, run out, occasional school run. It's no Sunday car and seems to deal with it all fine. Generally get 30-33mpg with very occasional 36.
It might be down to the big useless knob behind the steering wheel.

I don't mean to be rude, but it might be worth posting how you're calculating it...

My 20v Turbo averaged 21mpg for about 13 years. Commuting, it went up to 23mpg... After a recent rebuild, during the running in period (next to no boost or revs), it managed a record 31.8mpg over 400 odd miles.

I can just get 40mpg out of my Volvo S90 T4 (187bhp 2l turbo petrol) in Eco mode.

What fuel type are you using?

E10 is NOT recommended for the coupe according to big brother (I mean gov.uk E10 fuel checker). Running a coupe on E10 will affect your MPG IMHO...it does on my '07 E320i for sure.

We're supposed to be using Super which is still E5 (some garages round my way still sell 95RON E5)

DS

Hi again.
Filled up again.
Gauge showed almost half full at 308 miles.
Filled up with Tesco Momentum E5 ( but will follow Countrycruising's advice from now on )
Previously been running on Tesco cheap E5.
31.76 litres, couldn't get more in.
Gauge shows just above full.
Drove home 10 miles, odometer reads correctly.

308 ÷ 31.76 × 4.54 = 44mpg.

Our runs out are pleasurable but careful driving, but certainly no convoy behind me.

32L = 7 (UK) Gallons
308 miles from 7 gallons gives approx 44mpg…

Cant fault the math…

Do you use any fuel additives? Especially that increase octane rating? If the mpg is correct, its got to be getting the ‘extra’ RON/octane from another source other than the fuel…that or it is running super lean…

DS

When redex is £2, I'll put a small bottle in a tank of fuel, otherwise nothing. Tescos best unleaded, with occasional Asda.
How could it run super lean ? What must have happened ? We've had nothing done apart from a new thermostat 2000 miles ago.

I managed 46mpg overall on a 4500 mile trip to Alesund in my 16NA in north-west Norway, including some autobahn but mostly due to Norway's low speed limits, I think.

A point to remember: the size of the fill to 'full' can change slightly depending on the slope of the ground, the sensitivity of the cut-off on the pump, the temperature... On a small fill of a couple of gallons it doesn't take much to get a significant difference between calculated mpg; best to get an average of multiple fills.

Neil

I am getting 28-30mpg in and around Milton Keynes. Mostly short stretches of A/B roads interspaced with roundabouts, some 7m longer stretches at around 80mph. Not going easy on throttle.
On longer runs - say 40 miles on an A road with top speed around 70 I get around 35mpg (easier on throttle).
20V turbo with Gtec1 chip. 52K

That is very impressive for a coupe, NA or Turbo.

Just goes to show they can be economical.... sometimes.

My VIS will do 38mpg at gentle motorway speeds. 44mpg is very impressive though.

Gripped wanted a bit more information about my car

Photos attached

370 miles on Tesco Momentum E5. 38mpg. Closer to my expectations of 33-36. Weather not as warm ?

410 miles Tesco momentum. 37 mpg.

And again, nearly two years on.

450 miles, 37mpg.