mpg effect of cutting front valance?

Stoopid question time....

Am thinking of cutting front valance to improve angles/stop it gettin ripped orf, but am concerned about how it may affect the mpg, as it drives upto scorrrrtland a couple of times a year.

Anyone know the answer, have seen some ppl reckon it wrecks mpg, others think it improves it.

A car with the Aerodynamics of a wardrobe and you're asking about the valance!

you probably want to get rid of it to stop it catching off road, then you're gonna get some mud tyres put on it, then a light bar....

paint the whole car with hammertite, them dimples work for golfballs!