Yes
The first few miles the ECU learns the car and how the car uses fuel etc. This means the car will generally be higher in fuel useage than normal. The manufacturers MPG is generally very high-id take a few mpg off of it as its very unlikely to get that as many people do not drive that perfectly to get that high of a MPG. I was under the impression as the engine was ran in the ECU had a learning curve and was it had done this then it was far more fuel efficent. Originally Posted by Rolebama. Generally speaking, whatever you get 'running in' a new car, is what you can realistically expect after it has run in. If your car recommends premium gas: This is trickier. Years ago, says Edmunds.com, it more of an all-or-nothing deal, but many cars today have internal knock sensors that change the game. Now, many cars can adjust the engine's timing to prevent knock, thus allowing you to use lower octane gasoline if you so choose. In fact, if your car doesn't say anything about premium gas usage, all you'll be doing is dumping more money into your car. Premium gas will do nothing to increase the performance of a car that wasn't designed for it, so don't waste your money. Fuel Consumption. Generally for the first 500-1000 miles new engines are tight and will use a bit more fuel. You will see that the maker tels you not to exceed certain revs until the engine has bedded in. Years ago older engines had to be carefully run in up to max speeds for mileage covered. I was under the impression as the engine was ran in the ECU had a learning curve and was it had done this then it was far more fuel efficent. Originally Posted by Rolebama. Generally speaking, whatever you get 'running in' a new car, is what you can realistically expect after it has run in. If your car does not recommend premium gas: Then you don't need it. In fact, if your car doesn't say anything about premium gas usage, all you'll be doing is dumping more money into your car. Premium gas will do nothing to increase the performance of a car that wasn't designed for it, so don't waste your money. After the first 1000 miles gradually use more of the car's performance. It used to be absolutely essential to follow rigorous running-in procedures to get the best life and performance out of a new vehicle. You may even remember the sight of a new car moving slowly in the nearside lane of a motorway with a 'running-in, please pass' sign in the rear window. If you've never shopped for new cars before, we've got good news and bad news. The good news is that there's never been a more exciting time to buy a car. Fuel economy's up, technology's exploding and more manufacturers are fielding competitive vehicles than ever before.  In many cases, the answer is probably no -- you'll likely be able to use regular fuel with no noticeable issues except for minor losses in performance and gas mileage. If your owner's manual says that premium fuel is required, then you should do it, but your car won't blow up if you occasionally opt for regular. If your owner's manual says that premium fuel is recommended, then you can use regular gas all the time with no worries. ZIP Code. Change Cancel. This image is a stock photo and is not an exact representation of any vehicle offered for sale. by Doug DeMuro August 2014. The process of buying a car often involves a lot of research, and sometimes your research will reveal that the car you want requires premium fuel. This can be a big disappointment, since premium gas often costs 30 to 50 cents more than regular gas on average. Tweet. Think carefully about the type of fuel you choose for your new car. If you're thinking about buying a new car then it's important to think carefully about the type of fuel – changes to emissions regulations and engine design mean that what was the right choice last time you changed your car may not be this time.
http://www.rac.co.uk/forum/showthread.php?6715-Do-brand-new-cars-use-more-fuel-at-first http://lifehacker.com/5846880/should-i-use-premium-gas-in-my-car http://www.rac.co.uk/forum/showthread.php?6715-Do-brand-new-cars-use-more-fuel-at-first http://lifehacker.com/5846880/should-i-use-premium-gas-in-my-car http://www.theaa.com/motoring_advice/general-advice/running-in-a-new-car.html http://www.autotrader.com/best-cars/10-best-new-cars-for-first-time-buyers-2014-edition-215404 http://www.autotrader.com/car-news/buying-a-car-do-you-need-to-use-premium-gas-228198 https://www.theaa.com/motoring_advice/car-buyers-guide/cbg_fuel.html
do brand new cars use more fuel at first