i also read the article in the recent hpi magazine written by martin donnon , which basically shows an r32 gtr that has 289rwkws in shootout mode running on normal 98 ron then fuel is changed to uniteds boost 98 e10 ethanol blend and the mixtures lean right out straight away, but after a remap of ecu because the ethanol blended e10 fuel has 3.7% more oxygen the boost setting is left the same and more timing was screwed in which produced another 22rwkws. makes sense to me. think 100ron e5% would be even more power producing. any how im going to give it a shot! in conclusion yes your car will run like shit on this stuff if your running an aftermarket ecu tuned close to the edge , so you will need a remap, but if you run a non import car with stock ecu which tend to run more rich than you will probably find your car runs fine but you might as well save your money and run regular unleaded. my 50 cents.