Best mpg I’ve recorded with my 2023 2.0 TSI Sportline, 52.2 mpg on a 56 mile trip M25 & M1, running at 55-60 mph mostly. Outbound trip this morning was 44.1 mph at similar speeds. I’ve just started using Shell VPower unleaded could this be a factor or just coincidence.

Just a coincidence. I get similar mpg on supermarket fuel.

Most likely outbound trip was against the wind and the return journey was with the wind. That, plus variations in traffic and driving style could easily account for your mgg difference. Different fuel would only have a very minor impact, if any at all.

Edited 12 hours ago12 hr by mj01

3 hours ago, sussamb said:

I get similar mpg on supermarket fuel.

But you don't have a 2.0...

The big mpg killers are driving in town, roads which have many bends and speed limit changes and, despite what many will tell you, use of aircon. Our little car which does ~50mpg or more in normal conditions can't even reach 45mpg with auto aircon in the baking hot conditions we currently have. The general reason that cars get better mpg coming back is that they don't have to contend with starting from cold and the higher fuel consumption that results. My Karoq has done nearly 3000 miles according to the long term computer, at 49.8 mpg, and on the continent last month, when it was hot enough to crack our windscreen, we were getting 52 mpg even with the aircon running.

Our best recorded figure on a trip, all be it a short journey, was over 80 mpg. About 10 miles, aircon off, about 940 feet drop in elevation.

Always difficult to comment on one-off journeys, especially when quoting the display figures (unless confirmed to be accurate against measured refuels) but yes, a 52mpg return from a 2.0tsi would be pleasing.

I'd estimate that a 1.0 or 1.5tsi version driven in a similar manner/environment as you describe would probably get around 60mpg as the 2.0tsi is a nice performance engine but not particularly economical.

With regard to fuel, the general published consensus is that if your car is capable of adjusting to better quality fuel then you can expect about 1% improvement for each increase in RON rating and a little more if the better-quality fuel has lower levels of ethanol than the mandatory 10% in UK 95 RON fuel. Ethanol has 10% lower energy density that 'pure' petrol.

This particular trip is done regularly over the last 10 years. Outbound is south on the M1 and east on M25, prevailing wind is from the west and outbound is generally better mpg. I leave the aircon (climate control) set to auto and just vary the actual temp setting currently 20c , when the weather cools down it will be lowered to 17/18.

@Gerrycan I’d agree the 1.0 or 1.5 would have probably exceeded 60 mpg under similar conditions. I was predominantly in the left most lane, fewer vehicles, the three lanes to the right weren’t moving much faster and had many more vehicles on. What I did notice was when an artic container lorry pulled in after overtaking the instantaneous mpg jumped from 50 ish to 70 to 80 on the flat.

My 2024 1.5TSi SEL DSG Karoq averages 50+ when cruising on a not busy motorway at an indicated 70-75. My Leon FR 1.4TSi FR DSG would show 53-54. I suspect that's the affect of the Karoq's larger frontal area.

Normal driving around the Cotswolds drops the Karoq to anywhere between 42 to 45. The Leon would be 45 - 50. The extra weight of the Karoq is against it when accelerating or climbing hills. It is noticeable that the Karoq is often 1 gear lower when climbing particular hills than the Leon would have been at the same speed.

The 2 engines seem to have identical power & torque figures & curves although the 1.4 was smoother & quieter. Perhaps 50k miles against 10k may explain some of that.

I should also add that I have previously ‘validated’ the ‘Since refuelling MPG’ with brim-to-brim fuelling and the figures were within 0.5 miles per gallon, so I that’s good enough for me.