Reduce rolling resistance. Make sure your bearings are well-lubed, adjusted and in good shape. Also check your tires. For low rolling resistance you want narrow, smooth, hard pumped tires with thin sidewalls.
Also look at your posture. Make yourself narrow, low and pointy. Wear tight fitting clothes.
This question is missing some crucial info - which coast to coast?
Bike repairs can have different prices. It all depends on what is wrong with the bike.
Coast
Normally you can. In Amalfi coast you have company that arrange cycling excursions in campania region and bike rental services in whole Italian country.
If you have a broken bike spoke, you should first stop riding the bike to prevent further damage. Then, you can either replace the spoke yourself if you have the tools and knowledge, or take it to a bike shop for professional repair. Riding with a broken spoke can cause further damage to the wheel and affect the bike's performance.
If your bike crank arm is stripped, you should stop riding the bike immediately to prevent further damage. You will need to replace the crank arm or have it repaired by a professional bike mechanic. Continuing to ride with a stripped crank arm can be dangerous and may cause further damage to your bike.
If you have a wobbly bike crank, you should stop riding the bike immediately and have it inspected by a professional bike mechanic. Riding with a wobbly crank can cause further damage to the bike and potentially lead to accidents.
If your bike tire is bent, you should consider replacing it or taking it to a bike shop for repair. Riding on a bent tire can be unsafe and may cause further damage to your bike.
i would have to say the west coast because we have alot more dificult terrain to deal with with all the mountains and valleys.
The east coast of South America is much further east.
If your bike needs repair, you should take it to a bike shop or a professional bike mechanic for assessment and repair. Avoid riding a bike that is not in proper working condition to prevent accidents or further damage.
If you have a broken derailleur hanger on your bike, you should take it to a bike shop for repair or replacement. Riding with a broken derailleur hanger can cause further damage to your bike and may be unsafe.