Parkers overall rating: 3.9 out of 5 3.9

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 6.5 - 9.9 mpp
Diesel engines 7.4 - 12.4 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.

Fuel economy

Petrol engines 30.3 - 46.3 mpg
Diesel engines 36.7 - 61.4 mpg
  • Improvements on most popular engines
  • Diesel is still the most economical
  • Avoid the 2.0-litre petrol if you're after economy

The Vauxhall Insignia Grand Sport has a keen eye on costs, with 3-10% improvements in fuel consumption for the biggest sellers – the 1.5-litre Turbo petrol and 1.6 Turbo D diesel.

If you pick the 140hp petrol engine, this has a claimed 45.6-46.3mpg. Opt for the 165hp output and this drops down to 40.9-46.3mpg.

No surprises that the 1.6-litre diesel is the most efficient, with 56.5-57.6mpg boasted by the 110hp version (49.6-56.5mpg if you pick the 136hp) and even the larger 2.0-litre diesel with 170hp tops all the petrol figures with 47.9-53.3mpg.

The 210hp BiTurbo diesel is a little less impressive with fuel economy ranging between 37.7-39.8mpg, thanks in part to the automatic gearbox and all-wheel drive system.

The claimed 70.6mpg fuel economy figure is an ambitious figure to reach on the 1.6-litre diesel, but our test car showed signs that it should be able to comfortably reach those within the 50's. The only reservation we have comes when faced with long uphill climbs where you'll struggle to overtake slower traffic with much vigour. If you also carry passengers or heavy loads regularly, this may also have a detrimental effect on performance and economy.

Green credentials

The cheapest engine to run also boasts the lowest CO2 emissions – pick the 1.6-litre, 110hp unit and you can expect 106g/km. The 136hp variant ranges between 106-121g/km.

Opt for the 2.0-litre diesel and this ranges between 123-136g/km for the 170hp, but leaps to 176-187g/km with the BiTurbo D.

Petrol buyers will have to settle for 122-123g/km of CO2 from the 1.5-litre petrols.

Reliability

  • Overall Vauxhall Insignia Grand Tourer reliability should be strong
  • Previous car had two recalls but neither had any mechanical bearing
  • Strong interior construction with plenty of hard-wearing materials

It’s hard to say with any authority how this new car will perform in terms of reliability but if the old model is anything to go, there's not much to worry about.

The 1.5-litre petrol engine is the only new unit; the rest of the line-up are tried and tested in the Insignia and elsewhere.

The interior feels well-constructed and hard-wearing so we’d have little concern about bits falling off or becoming damaged over time.

We had a Vauxhall Insignia on the Parkers fleet for six months and recorded two problems, that you can read about here - firstly it kept misting up and the electronic parking brake needed attention. Both issues were quickly fixed.

Recalls since 2018 relate to the outer rear seatbelts, the central door locking system unlocking the vehicle when parked and the fuel line potentially resulting in a leak. We'd advise searching on the DVSA site for any listed recalls.

Ongoing running costs

Road tax (12 months) £150 - £475
Insurance group 13 - 28
How much is it to insure?