commute on Single speed jump bike

ive started to commute on my jump bike and am really struggling at the moment. im just looking for advice on what i can do to make it easier its only 2.5 miles each way. ive already lifted my seat post up to its marks and it helped. gears is not an option. bike has a 180mm disc on the back. im looking into "road" tyres for my spare wheels to allow me to still play with out much effort
I rode what you dug last summer
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My methods of commuting were either: walking/running, skateboard (longboard), ride my BMX (usually with my skateboard mounted to my rucksack) or ride a jump bike (usually with my skateboard on rucksack).... Mainly depended on:
1. was the jump bike in working order - yes, ride that, no:
2. was the BMX in working order - yes, ride that, no:
3. was the weather really bad (i.e. wet or icy)? no, take the longboard, yes:
4. Walk with a bit of running to the station.
Tyres is the next best thing, so yeah, go for the tyres
GT Arrowhead
GT Chucker XS1
Raleigh Mirage (Commuter)
Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8
also now has hope tech evo m4 rear and the m575 up front