Before you chip your engine, be aware that you will almost certainly invalidate your warrantee - if you are still within the warrantee period, of course. The chip will re-map the engines ECU (the computer that controls things like fuel injected, air intake and engine revs). The engine will perform in a completely different way and the net result is that you can get close to 110bhp output from the same engine. But there is a cost; fuel economy being one of them. The other cost is the additional stress that the engine will be under (hence the warrantee concerns). Don't expect the engine to last as long or be as reliable. If the engine, in its present format, was designed for 110bhp then I am sure Citroen would have built it that way instead of going to the expense of developing a totally new engine for the 1.6HDi. This is an aluminium 16 valve engine with a different turbo charger that is small enough to accommodate an intercooler under the bonnet, hence the 110bhp output. You also have to consider the additional load that a more powerful chipped engine will put on the rest of the car, especially brakes, steering and suspension. They were all designed for a 90bhp version so beware. You might also like to take the advice of your insurance company as, of course, chipping an engine is a major modification. My 2.0HDi isn't chipped; I tow a caravan quite comfortably at 34mpg, I drive solo at 50+mpg (lower if all my driving is around town), I can do 70 - 80mph quite happily (if illegally) from London to Bristol and back again and would achieve even higher speeds if the blasted speedo wasn't right in the middle where my co-pilot can monitor my driving and make her wifely observations. It's your car so do as you wish, but take a lot more advice before you go down the chip shop.
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