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I changed my Dunlop Sp1's for Falken 452's at the weekend and have noticed a drop of around 3-4 Mpg !.
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In there defence though my car does ride smoother
I suppose if I said my fabia's dash said I got 64mpg on way home last night, it wouldn't be good eh? Best way I have found to keep mpg high is to use the low down torque, where is little boost. Boost is what causes poor mpg, as it's related to fuel injection. Also, keep car in gear when off throttle on downhills as they use ZERO fuel in that state. Momentum alone keeps the engine alive.
I average around the 500 mile mark from a £45 fill-up of diesel, which is fine for me. A bit above 50mpg in reality.
Have you checked the pressures ? If the ride feels less harsh and you've dropped a few MPG, I'd check the pressures are right. Most tyre places just guess at a pressure when they fit new tyres.